47results about How to "Increase fluid volume" patented technology

A method and device for reducing the damaging effects of radiant energy, blast, or concussive events includes applying pressure to at least one jugular vein to reduce the egress of blood from the cranial cavity during or before the incidence of the imparting event. Reducing blood outflow from the cranial cavity increases intracranial volume and / or pressure of the cerebrospinal fluid to reduce the risk of traumatic brain injury and injuries to the spinal column. Reducing blood outflow further increases the intracranial pressure and volume, and thereby increases the pressure and volume of the cochlear fluid, the vitreous humor and the cerebrospinal fluid to thereby reduce the risk of injury to the inner ear, internal structure of the eye and of the spinal column. In addition, increasing intracranial pressure and volume reduces the likelihood of brain injury and any associated loss of olfactory function

The invention discloses a three-station DITO full-automatic testing machine and a testing process thereof. The testing machine comprises a feeding part, a testing part and a discharging part. The testing machine disclosed by the invention comprises the following technical steps: product feeding, product taking and product detection, product photographing correction, product function testing, product transferring and defective product screening, product position correcting and discharging, and material tray discharging. According to the testing machine, a plurality of products are loaded in a centralized manner by adopting the material tray, and the loading part and the discharging part are connected to the front end and the back end of the tested part; the material trays of the feeding part and the discharging part are of a circulating flow type structure, meanwhile, the circulating type taking and placing of the products and the material trays are realized, and the material flowing volume is greatly improved through a laminating and conveying mode; and the test part adopts multi-test-station design, the time periods of testing and product taking and placing are effectively utilized, so that uninterrupted lead-out of the test products is realized, and the screen testing efficiency is greatly improved; and single-piece detection, defective product scanning by two-dimensional codes and the like are integrated to realize real-time screening of defective products.

The invention discloses an ambroxol hydrochloride oral solution and a preparation method thereof, and relates to a preparation method of western medicine, in particular to a medical production formula used for curing bronchitis and a preparation method thereof; the preparation method comprises the following steps: sucrose, preservatives and purified water are dissolved in a mixing mode so as to prepare simple syrup; the ambroxol hydrochloride, corrigents and preservatives are dissolved by the purified water so as to prepare ambroxol hydrochloride solution; the ambroxol hydrochloride solution and the simple syrup are stirred and mixed evenly, the corrigents and the preservatives are added successively and discontinuously and then the purified water is added to adjust the concentration. The invention has simple and reasonable process, and is easy to operate practically and the produced products have good stability; the products can used as common phlegm-eliminating drugs, has functions of increasing the liquid level of the respiratory tract, reducing mucus secretion, enhancing the secretion of pulmonary surfactant and the movement of cilium and preventing cough to a certain extent, and is applicable to acute respiratory disease and chronic respiratory disease, such as ropy sputum and difficult cough caused by acute bronchitis and chronic bronchitis, bronchial asthma and pulmonary tuberculosis, etc.

The invention relates to a water-based acrylic painting pigment which comprises the following components in parts by weight: 40-50 parts of acrylic acid emulsion, 5-10 parts of thickener, 10-15 parts of toner, 0.2-0.4 part of dispersing agent, 0.02-0.05 part of preservative and 15-20 parts of water. The thickener is a hydroxy cellulose / alkali-soluble thickener mixture. Since the hydrophobic main chain of the hydroxy cellulose and the surrounding water molecules are associated through hydrogen bond, the thickener adopted by the water-based acrylic painting pigment enhances the fluid volume of the polymer, and reduces the free motion space of particles, thereby enhancing the viscosity of the whole pigment system. Furthermore, the dispersing agent has lower surface tension, and has favorable dispersion effect on the toner and the like. In the drying film-formation process, as the water and ammonia are evaporated, the acrylic resin is cured again to form a paint film which can not be hydrolyzed or softened any more, thereby avoiding the phenomenon of mutual adhesion.

The invention discloses a gypsum-based composite binding material for extruded 3D printing and a preparation method thereof and relates to the field of civil engineering / 3D printing materials. Aimingat defects in the prior art, the invention provides the gypsum-based composite binding material for extruded 3D printing. The binding material is prepared from the following components: gypsum, pre-excited material, mineral additives, a plasticized water reducing agent, a waterproof agent, a crystal habit improver, a cystallizing stabilizer, a retarder, a dispersing agent, a water-retentive and thickening admixture, an adhesive, an antifoaming agent, a crystal modifier, a lubricating agent and fibers. The binding material disclosed by the invention has the beneficial effects that the preparedgypsum-based composite binding material for extruded 3D printing is wide in source, excellent in liquidity and environmentally friendly and has excellent extrusion continuity, constructability, mechanical property, water seepage resistance and cracking resistance.

The invention discloses a high-flow dynamic output control method of a cartridge valve. The high-flow dynamic output control method of the cartridge valve comprises the steps that a DT2 oil path of acontrol solenoid valve is through while a DT1 oil path of the control solenoid valve is stopped, hydraulic oil inside a first oil conveying channel passes through the DT2 oil path to return to an oiltank so that a guide shaft can provide power for a valve element sleeving the guide shaft, and thus the valve element is driven to move upwards; the DT1 oil path of the control solenoid valve is through while the DT2 oil path of the control solenoid valve is stopped, hydraulic oil inside a second oil conveying channel passes through the DT1 oil path to return to the oil tank so that the guide shaft can provide supporting power for the valve element, and thus the valve element is driven to move downwards; a second oil outlet communicates with a third oil outlet, and hydraulic oil inside the third oil outlet is discharged out from the second oil outlet. The invention further provides the high-flow dynamic output cartridge valve for implementation of the method. By increasing the flow of thecartridge valve and improving flow stability, the requirements of providing sufficient power and stable control for large piling machines of 1000 tons or above.

The invention provides anoil well low differential pressure addition sand prevention process method. The method includes the following steps of step 1 preparingwellholes, lifting original well tubularcolumns, conductingexploratory sand, pigging, scraping tubes, and performingpressure tests on oil tubes and casings; step 2, pretreating stratum, after the tubular columns are put in, openingaoil tubevalve to control spray, conducting nitrogen foam flowback, conducting exploratory sand, and washing wells; step 3, performing gravel filling sand prevention construction; step 4, performing sand filter tube hanging sand prevention construction; step 5, performing anti-adsorbent agent squeezing construction. The methodcan reduce the additional resistance of a gravel filling layer and a wellhole sand blocking layer of the well near the oil reservoir oil well of water flooding, polymer flooding and the polymer flooding converting into the subsequent water flooding, and is the most effective sandprevention process for loosing extract production of the oil well in the middle and later periods of sandstone oil reservoirs.

The invention discloses a pneumatic control device for the liquid level. The pneumatic control device is used for a battery formation tank and comprises an angular lever and an adjustor body, the angular lever is communicated with the battery formation tank, and the bottom of the battery formation tank is communicated with a water inlet tube. A float ball arranged inside the battery formation tank is connected to one end of the angular lever, and a slide valve is connected to the other end of the angular lever. A first cavity and a second cavity communicated with the atmosphere are formed inside the adjustor body, wherein the second cavity is separated from the first cavity through a first membrane. A third cavity is formed below the second cavity and separated from the second cavity through a corrugated pipe, a fourth cavity is formed below the third cavity, a second membrane is arranged between the third cavity and the fourth cavity communicated with the third cavity through a guide pipe, the fourth cavity is communicated with an air inlet two-way branch pipe, and the two-way branch pipe is communicated with the slide valve. The pneumatic control device for the liquid level can automatically control the liquid level inside the water tank of a battery formation device.

A preparation method of low-temperature curing conductive copper paste belongs to the field of flexible electronics. The conductive copper paste comprises the following raw materials by mass: 20%-53% of a copper salt, 0.25%-5% of nano copper powder, 0.1%-3% of a binder, 10%-30% of a solvent, and 35%-55% of a reducing agent. The preparation method comprises the following steps of: firstly adding the binder into the solvent to form a mixed solution, then adding the copper salt and the nano-copper powder into the mixed solution, finally adding the reducing agent to form mixed paste, and controlling the viscosity of the mixed paste to be 10 Pa.s to 60 Pa.s; adding the mixed paste into a planetary stirrer, stirring for 20-60 minutes, and carrying out primary dispersion; and adding the mixed paste obtained after primary dispersion into a three-roller mill for secondary dispersion. The obtained conductive copper paste can be subjected to low-temperature curing at the temperature of 180 DEG C or below and is suitable for circuit printing or electronic element preparation in flexible devices, all raw materials are nontoxic and harmless, and the green production requirement is met.

A drilling system (10) including a drill string (13) which extends from a floating drilling rig to a well bore, and a tubular riser (12) which surrounds at least part of the portion of the drill string (13) between the well bore and drilling rig, the riser (12) having a telescopic joint (20) between a first tubular portion and a second tubular portion of the riser, the first tubular portion extending down to a well head at the top of the well bore and the second tubular portion extending up towards the drilling rig, the telescopic joint (20) comprising an inner tube part (20b) which is mounted within an outer tube part (20a), the drilling system (10) further including a riser closure device (26) which is mounted in the second tubular portion of the riser (12) and which is operable to provide a substantially fluid tight seal between the riser (12) and the drill string (13); whilst permitting the drill string (13) to rotate relative to the riser (12).

The invention discloses a water and fertilizer integrated device for agricultural planting. The water and fertilizer integrated device comprises a spraying mechanism and movement mechanisms, wherein the spraying mechanism comprises a plurality of liquid storage tanks, a proportioning tank and a spraying opening, the plurality of liquid storage tanks are connected with the proportioning tank through a first pipeline, the proportioning tank is connected with the spraying opening through a second pipeline, and a spraying pump is arranged in the spraying opening; and the movement mechanisms are connected to the two sides of the spraying mechanism, and each movement mechanism comprises a plurality of crawler belts, and the crawler belts are connected with motors and can drive the device to move. Water and fertilizer integration is achieved through the mobile machine, a series of work such as storage and proportioning is achieved in the device, mobile spraying can be conducted, spraying is more uniform, meanwhile, a large amount of manpower and material resources are saved, and work is efficiently completed. The automatic control principle is adopted, the functions of watering, fertilizing and the like are automatically achieved, remote control can be achieved, and real-time control is more convenient; The water and fertilizer integrated device is comprehensive in function, good in use experience and high in commercial value.

Disclosed are a closed mechanical-seal pump ring and a shaft-seal flushing system with the same. The pump ring is provided with an annular left pump ring side plate and an annular right pump ring side plate which are parallel to each other, inner circumferences of the left pump ring side plate and the right pump ring side plate sleeve the outer circumferential surface of a shaft sleeve of a centrifugal pump, the outer circumferential edges of the left pump ring side plate and the right pump ring side plate are connected with a sealing gland of the centrifugal pump at an interval, a plurality of blades in rotatable and radial arrangement are arranged between the left pump ring side plate and the right pump ring side plate and are perpendicular to the left pump ring side plate and the right pump ring side plate, an end opening formed by closing ends of the radial blades corresponds to a liquid outlet of the shaft sleeve, and an end opening formed by edges of radial ends of the radial blades corresponds to a liquid inlet of a liquid outlet passage formed on the sealing gland. The closed mechanical-seal pump ring has the advantages that liquid accelerating distance is increased, and idle work is reduced; most liquid in a seal cavity can be enabled to flow, and a fluid flowing path can be lengthened to widen the flow area.

The invention relates to a preparation method of thick and high-tenacity bonding type powdered neoprene. The preparation method comprises the following steps of adding neoprene, a thickening agent, water and a molecular weight regulator to a polymerizing pot in sequence; replacing with nitrogen; agitating and heating; adding an initiating agent and an activating agent while the temperature of the polymerizing pot reaches 20 to 35 DEG C; performing graft polymerization reaction at 30 to 50 DEG C; adding a termination agent after the polymerization conversion rate reaches 65 to 75% in order to obtain graft neoprene latex; adding the graft neoprene latex to a condensation kettle; adding a parting agent and a coagulant under the coagulation temperature of 10 to 30 DEG C; uniformly agitating and mixing; heating to reach 20 to 60 DEG C for ageing for 4 to 6 hours; and then separating, dehydrating and drying to obtain thick and high-tenacity bonding type powdered neoprene. The prepared powdered neoprene has the characteristics that the powder size ranges from 0.60 to 1.20mm, the powdered ratio is not less than 99.5%, the ash content is not greater than 0.10%, the volatile matter is not greater than 0.12%, the swelling time is 2 to 15 seconds, the dissolution needs 1 to 3 hours, and the peeling strength is not less than 90N / cm.

A clutch is adapted to transmit torque.A carrier for a friction element of the clutch includes an axis of rotation, a radial portion and a radially outer axial portion adjacent thereto.The axial portion comprises a revolving around the rotational axis of the sheet metal part, extending alternately at different radii around the rotational axis to form an outer teeth for positive engagement in the friction element. In a region which lies on the larger radius, the sheet metal part is provided with an opening for the radial passage of a surrounding liquid and the sheet metal part bears radially inside a storage element for damming the surrounding liquid, wherein the storage element is the radial section with respect to the breakdown opposite.

The invention discloses a high-rupture-strength baking-free brick. The high-rupture-strength baking-free brick is prepared from the raw materials including ordinary Portland cement 42.5, gravels, medium sand, nano calcium carbonate, mineral powder, nano silicon dioxide, nano aluminum oxide, coal cash, talcum powder, ferric chloride, magnesium chloride, magnesium oxide, modified carbon fiber, asbestos fiber, plant straw, sepiolite, polystyrene emulsion, polyvinyl acetate emulsion, polyphenyl emulsion, bentyl benzene emulsion, water reducer, accelerator, thickener, polyvinyl alcohol, dispersant, diffusant, water, silane coupling agent KH-570 and modified additives. The invention also discloses a preparation method of the high-rupture-strength baking-free brick. The prepared high-rupture-strength baking-free brick is excellent in rupture strength.

The invention provides a reasonable liquid extracting method specific to a roof ridge fault block oil reservoir. The reasonable liquid extracting method specific to the roof ridge fault block oil reservoir comprises the steps that 1, according to the geological parameters and the exploitation stage of an oil reservoir, the roof ridge fault block oil reservoir where a liquid extracting measure can be conducted is determined; 2, exploitation condition analysis is conducted on the selected oil reservoir, and the current open oil-water well condition is mainly analyzed; and 3, according to the actual conditions of the oil reservoir, the technical policies such as the liquid extracting range, the liquid extracting mode, oil reservoir average formation pressure keeping level for conducting the liquid extracting measure are determined. Through the reasonable liquid extracting method specific to the roof ridge fault block oil reservoir, timely and reasonable liquid extracting for the roof ridge fault block oil reservoir can be effectively guided, and technical support is provided for keeping the stable yield and improving the development effect for the roof ridge fault block oil reservoir in an ultrahigh water-cut stage.

The invention discloses a switch valve and a gas-filling device of a gas cylinder. The gas-filling device comprises the switch valve connected to a gas cylinder, a manual inflator, and a connection pipe for connecting the switch valve and the manual inflator. The switch valve comprises a valve seat which is connected to an opening of the gas cylinder, a switch unit which is installed on the valve seat and is used for releasing a liquid and blocking a liquid from entering into the gas cylinder, and a connection unit. The connection unit comprises a plug located at one side of the valve seat and a joint located at the other side of the valve seat. The adjacent switch valves can be connected by the opposite plugs and joints so that multiple gas cylinders can be communicated and thus a stored liquid amount is greatly improved and practicality and use convenience are obtained.

The invention discloses a multifunctional self-service car washer and a billing method. The car washer comprises a control module, a water supplying module, a cleaning mixed liquid supplying module, a charging module, a billing module and a cleaning tool, wherein the cleaning tool comprises a water gun and a brush; the water gun and the brush are connected with the water supplying module and the cleaning mixed liquid supplying module through pipes; each of the water gun and the brush is provided with a selecting switch for selecting water or cleaning mixed liquid; the billing module comprises a water metering unit and a cleaning mixed liquid metering unit; and the water metering unit and the cleaning mixed liquid metering unit respectively meter the using amount of water and the using amount of cleaning mixed liquid independently. According to the scheme, the multifunctional self-service car washer is provided with the brush, a user can easily clean a car body, a cleaning effect of the multifunctional self-service car washer is far higher than a cleaning effect of a self-service car washer with a single water gun, and the washed car body is clean and does not have spots or marks; metering and billing on the water are separated from metering and billing on the cleaning mixed liquid, the water and the cleaning mixed liquid are billed respectively, waste is avoided, and environmental protection is facilitated; and the designed structure of the brush is unique, the brush is easy to use and can be used for cleaning the car body thoroughly, particularly, water and energy can be saved, the market prospect is wide, and the environmental protection significance is far-reaching.

A preparation method for low-temperature curing conductive copper paste, which belongs to the field of flexible electronics. The raw material composition of the conductive copper paste is as follows in terms of mass percentage: copper salt 20%~53%, nano copper powder 0.25%~5%, binder 0.1% ~3%, solvent 10%~30%, reducing agent 35%~55%; first add binder to the solvent to form a mixed solution, then add copper salt and nano-copper powder to the mixed solution, and finally add reducing agent to form Mix the slurry, control the viscosity of the mixed slurry to 10Pa·s~60Pa·s; add the mixed slurry to the planetary mixer and stir for 20-60 minutes for a dispersion; add the mixed slurry after the first dispersion to the three-roll mill After secondary dispersion, the obtained conductive copper paste can be cured at a low temperature below 180°C, which is suitable for circuit printing in flexible devices or the preparation of electronic components, and all raw materials are non-toxic and harmless, meeting the requirements of green production.

The invention relates to the technical field of biological cell culture, and discloses biological culture dish nutrient solution proper amount self-adding equipment which comprises a frame body, the top of the frame body is movably connected with a bearing mechanism, the bottom of the frame body is provided with a movement cavity, a clamping cover is arranged above the frame body, and the top of the clamping cover is fixedly connected with a solution supply mechanism. According to the biological culture dish nutrient solution proper amount self-adding equipment, when an excitation contact moves upwards and is disconnected, a cam shaft core motor is triggered to be started, under transmission of a second connecting rod, a push block drives a sleeve plug to reciprocate left and right, a nutrient solution is pushed into the dish, cover lifting operation is avoided, along with the consumption of a certain weight of the nutrient solution in the dish, the bearing disc moves upwards to make the arc block rotate so as to change the resistance value of the electromagnet connected to an adjusting contact, the relative distance change between the left inner wall of the sleeve plug and the push block is controlled, the liquid amount of single pushing of the sleeve plug is changed, the effect of automatically adding the nutrient solution based on the weight of the dish is achieved, and the automation degree of the equipment is improved.

The invention discloses a piezoelectric pulse propeller with high mass flow and an underwater robot. The pusher comprises an inflow layer, a composite alloy layer, a vibration substrate layer, a vibration layer, an upper electrode layer and a shell layer which are sequentially stacked, and a blocking layer and an O-shaped sealing ring which are located between the composite alloy layer and the vibration substrate layer. A gap between the O-shaped sealing ring and the blocking layer forms a variable pressure chamber; according to the invention, when the piezoelectric vibrator performs negative displacement, the radial edge of the vibrator is firstly tightly attached to the sealing ring, the volume of the variable-pressure chamber is increased, and fluid is sucked due to negative pressure; when the piezoelectric vibrator moves positively, the center of the vibrator is firstly tightly attached to the inflow hole of the composite alloy layer, the radial edge of the vibrator is far away from the sealing ring, fluid in the variable-pressure cavity is forced to enter the output flow channel, the fluid lost by the output flow channel when the piezoelectric vibrator moves negatively is supplemented, and fluid is provided for next spraying; and high-frequency vibration is carried out in cycles, so that pulse injection of the fluid is realized, and one-way high-quality flow conveying of the fluid is realized.

The invention relates to a cooling channel for a winding overhang of an electrical machine, wherein, in order to conduct a cooling fluid, said cooling channel is designed with at least one inflow 25 and at least one outflow 26 and is annular for provision around the winding overhang 3, 4. In order to achieve improved sealing properties, the cooling channel has an axially movable contact pressure part 21 that is situated such that a cooling fluid flows against the contact pressure part 21, thus generating a contact pressure on the cooling channel.

The invention relates to a method designing a multi-overflow tray by an equal residence time method, which is intended to raise tray mass transfer efficiency and processing capability, and alleviate amplification effect of equipment. The method is defined by residence time of the liquid on a tray bubbling zone, integrates advantages using an equal channel length method and an equal bubbling area method, takes regard of a contraction effect of a tower wall to a liquid flow and influence of physical property condition on the flow, and provides a calculating formula of the channel length in the tray bubbling zone under the equal residence time. Downcomer weirs on the edge at two sides of the tray are in a backswept weir structure, in order to increase overflow circumference length of the downcomer at two sides. A lower edge of an eccentric downcomer uses an arc or tooth-form structure, in order to balance a bottom gap outlet area of the downcomer. A liquid distribution plate is arranged in a liquid accepting plate, in order to balance liquid flow distribution at two sides of the downcomer. The method enables the liquid flow on each tray bubbling zone to have similar residence time and mass transfer efficiency, and achieves effects of reasonably distributing liquid, promoting gas and liquid uniform distribution and alleviating amplification effect of the tower equipment. The method is particularly suitable for large-scale tower equipment with high gas-liquid phase load.

The invention discloses a preparation method of a high-ductility copper foil. The preparation method comprises the following steps that S1, a cathode copper plate or copper wire with the purity larger than or equal to 99.95% is added into a copper dissolving tank 1 containing sulfuric acid, high-temperature air is blown by using a screw fan, and copper is dissolved to prepare a copper sulfate solution; S2, the copper sulfate solution is subjected to multi-stage filtration and enters an electrolyte tank 2 to be stored; S3, an additive is added into the electrolyte tank 2; and S4, the copper sulfate in the electrolyte tank 2 is conveyed to a foil generating machine 3 for electrolytic foil generating. According to the preparation method, the concentration and temperature of copper acid in the electrolyte are more optimized and reasonable, the complexing effect is more prominent after a polymer thickening agent is added into the additive, and copper foil crystal bond combination is firmer, so that the characteristic of high ductility of the copper foil is achieved.

The invention discloses a switch valve and a gas-filling device of a gas cylinder. The gas-filling device comprises the switch valve connected to a gas cylinder, a manual inflator, and a connection pipe for connecting the switch valve and the manual inflator. The switch valve comprises a valve seat which is connected to an opening of the gas cylinder, a switch unit which is installed on the valve seat and is used for releasing a liquid and blocking a liquid from entering into the gas cylinder, and a connection unit. The connection unit comprises a plug located at one side of the valve seat and a joint located at the other side of the valve seat. The adjacent switch valves can be connected by the opposite plugs and joints so that multiple gas cylinders can be communicated and thus a stored liquid amount is greatly improved and practicality and use convenience are obtained.

Disclosed is a closed type mechanical sealing pump efficiency ring. The pump efficiency ring is provided with annular left side plate (701) of the pump efficiency ring and right side plate (702) of the pump efficiency ring mutually arranged in parallel; inner rings of the left side plate (701) of the pump efficiency ring and the right side plate (702) of the pump efficiency ring are sheathed on a peripheral surface of a shaft sleeve (12) of a centrifugal pump, peripheries of the left side plate (701) of the pump efficiency ring and the right side plate (702) of the pump efficiency ring are linked to a sealing gland of the centrifugal pump and have gaps, a plurality of blades (703) rotationally arranged in a radiation state is arranged between the left side plate (701) of the pump efficiency ring and the right side plate (702) of the pump efficiency ring, the plurality of blades (703) is in vertical arrangement with the left side plate (701) of the pump efficiency ring and the right side plate (702) of the pump efficiency ring, end openings formed by closing-in ends of the plurality of blades (703) in the radiation state correspond to a liquid outlet of the shaft sleeve (12), and end openings formed by radiating ends of the plurality of blades (703) in the radiation state correspond to a liquid inlet formed on a liquid outlet passage on the sealing gland. Also disclosed is a shaft seal flushing system having the pump efficiency ring. The pump efficiency ring enables the majority of a liquid in a sealing cavity to flow, increases an accelerated distance of the liquid and lengthens a flowing path of the liquid, thereby enlarging the orifice area.

The invention relates to a 4V lead-acid storage battery for navigation aids, which is characterized in that it includes a battery case, a battery cover, a positive pole, a negative pole, a bus bar group, an electrode group assembly, and a cover sheet, wherein a cavity is provided on the battery case, and Electrolyte is provided in the installation cavity; the pole group assembly includes the first pole group, the second pole group, the third pole group, the fourth pole group, the fifth pole group, the sixth pole group, the pole group The first pole group, the second pole group, and the third pole group are respectively arranged in three of the mounting cavities and connected in parallel through the bus bars, and the fourth pole group, the fifth pole group, and the sixth pole group They are respectively arranged in the other three placement cavities and connected in parallel through bus bars. The positive and negative poles are respectively connected to the corresponding bus bars. The battery cover is placed on the battery case, and the positive and negative poles are inserted into the battery cover. The invention has the advantages of convenient assembly, high reliability, high safety, long service life and the like.