44results about How to "Easy to pry" patented technology

The invention provides a making method of jasmine tea cakes. The method comprises the following steps of: picking tea leaves, harvesting, spreading, removing green, twisting, baking and drying, cooling, curing fresh flowers, blending jasmine, dredging the jasmine to dissipate heat, selecting the jasmine out, and pressing the tea leaves and the jasmine to obtain the cakes. The making method provided by the invention makes up the defects of light aroma, light taste and the like of the conventional tea; the tea cakes are attractive in appearance, moderate in tightness, easy to prize and convenient to store and carry; and the tea cakes full adsorb the jasmine aroma in the making process, so that the aroma of the tea cakes is thicker and purer, and the aftertaste of tea made from the tea cakes is sweat.

The invention relates to a tea cake of white tea and a preparation method thereof, and belongs to the technical field of the processing of white tea. The tea cake of the white tea is prepared from tea fresh leaves which are used for preparing the white tea and serve as raw materials through processes of tea airing, tea shaking, spreading for cooling, rolling, primary drying, sorting, cake pressing and repeated drying; and tea varieties of the prepared white tea are one or more of Fuding white tea, Fuding pekoe, Zhenghe white tea and vegetable tea. According to the method, the white tea which is loosened in appearance and easy to break is pressed to form the tea cake, so that the tea cake is attractive in appearance, moderate in degree of tightness, easy to prize, convenient to store and carry, strong and pure in fragrance and sweet in aftertaste, is popular among consumers and has obvious economic benefit, and slight enzymatic reaction can be generated in the storage process.

A water supply system is described for supplying water to a linearly moving irrigation system. The water supply system is able to take water from a stationary water supply conduit (either a collapsible conduit or a rigid conduit) and feed it into one end of a feed pipe for the irrigation system. The water supply system includes a pickup shoe which extends into the water supply conduit through a traveling opening in the top side of the conduit. The pickup shoe intercepts substantially all of the water in the supply conduit and pumps it upwardly through the traveling opening to the feed pipe for the irrigation system. The pump is located in the portion of the shoe which extends into the supply conduit. In another embodiment, the water supply conduit can be an open channel.

A mine drill stem capable of being rapidly dismounted and connected comprises a drill tail and a drill library, wherein an inner cavity of the drill library and the drill tail are both of a square or hexagonal structure; an inverted-U-type clamping cap is fixedly arranged on the side wall of the drill library so as to form a cavity between the clamping cap and the side wall of the drill library; an insertion block is arranged inside the cavity in a vertical sliding mode and composed of a square limiting block and a pin rod; the square limiting block at the bottom of the insertion block penetrates through the side wall of the drill library and then extends into the inner cavity of the drill library; a clamping block is arranged on the side wall of the top of the square limiting block; the pin rod on the top of the insertion block is perpendicularly arranged in a through hole in the top wall of the clamping cap in a penetrating mode; a compression spring is arranged between the top wall of the clamping cap and the square limiting block and located inside the cavity; a hemisphere used for jacking up the square limiting block is arranged at the end of the drill tail; and under the state that the drill tail is completely inserted into the inner cavity of the drill library, a clamping groove matched with the square limiting block is formed in a rod body of the drill tail in the circumferential direction. According to the mine drill stem capable of being rapidly dismounted and connected, the elastic insertion block is arranged between the drill tail and the drill library to conduct limiting, and rapid dismounting and connection of the drill stem are realized.

The invention discloses a complete casting, demolding, taking and conveying device, and belongs to the technical field of casting. Prizing assemblies are symmetrically arranged on the two sides of an ingot mold. The bottoms of the prizing assemblies are fixed to the ground. A track is arranged on the periphery of the ingot mold and is an annular track. Track turning devices are arranged at the corners of the track. A casting opening is formed in one end of the ingot mold, and a storage trolley is arranged at the other end of the ingot mold. A drainage trolley is movably arranged on the track. A crushed aggregate shoveling device is arranged over the ingot mold. A plurality of prizing mechanical arms are evenly arranged in the middle of a connecting rod. The complete casting, demolding, taking and conveying device is reasonable in structural design, a worker is prevented from making contact with forming equipment in the short distance, the work environment is improved, and danger is lowered. Meanwhile, by means of the full-automatic device, the labor intensity of the worker is lowered, and the machining efficiency is improved.

The invention discloses a heat-dissipation optimization type photovoltaic terminal box which comprises a mounting plate fixed in a box body, wherein a plurality of current guide strips are fixed on the mounting plate; a strap clamp triangular spring, a cable clamp triangular spring and a pipe clamp triangular clamp are mounted on each current guide strip; and a diode is mounted between every two pipe clamp triangular clamps of adjacent current guide strips. According to the heat-dissipation optimization type photovoltaic terminal box, the diodes on the mounting plate are distributed in a staggered manner and located on different straight lines, so that heat is relatively dispersive; a heat distance of pins of the diodes of the same current guide strip is far, so that the heat conduction and dissipation space is enlarged; and the pins of the middle diodes are clamped and connected through the pipe clamp triangular springs and further sufficiently contacted with the current guide strips so as to form second connecting points. The invention further designs a buckled position fixing structure of the current guide strips and the mounting plate, bosses are arranged on the mounting plate, and the strap clamp triangular springs and the pipe clamp triangular springs can be conveniently levered with the bosses serving as pivots, so that the terminal box is convenient to mount and dismount.

A water supply system is described for supplying water to a linearly moving irrigation system. The water supply system is able to take water from a stationary water supply conduit (either a collapsible conduit or a rigid conduit) and feed it into one end of a feed pipe for the irrigation system. The water supply system includes a pickup shoe which extends into the water supply conduit through a traveling opening in the top side of the conduit. The pickup shoe intercepts substantially all of the water in the supply conduit and pumps it upwardly through the traveling opening to the feed pipe for the irrigation system. The pump is located in the portion of the shoe which extends into the supply conduit.

The invention discloses a H2 (hydrogen) purifying system and a gas treatment system, and relates to the technical field of H2 purifying. The H2 purifying system comprises a raw gas pipeline, a product gas pipeline, a reverse gas bleeding pipeline, a rotary valve and an adsorption tower, wherein the rotary valve comprises a non-rotary part and a rotary part; the non-rotary part is provided with a first flow passage, and the rotary part is provided with a second flow passage; the rotary part is rotated to enable the second flow passage to selectively communicate the raw pipe pipeline, the product gas pipeline, the reverse gas bleeding pipeline and the adsorption tower. The gas treatment system comprises the H2 purifying system. The H2 purifying system and the gas treatment system have the advantage that multiple pipelines are controlled by one rotary valve, so that the cost is reduced, and the control is convenient.

The invention discloses a guide pillar type anti-collision beehive which is characterized by comprising a pedestal, a box body peripheral frame, an upper cover and frames, wherein the box body peripheral frame is formed by surrounding of a front box plate, a rear box plate, a left box plate and a right box plate; an inlet is formed in the lower part of the box body peripheral frame; a mesh bracket is arranged at the upper part of the box body peripheral frame; vent holes are formed in the side wall of the upper cover; the frames are rectangular frames formed by surrounding of upper beams, lower beams, left side pillars and right side pillars; the upper beams are longer than the lower beams, and two ends of each upper beam respectively extend out of each left side pillar and each right side pillar to form hanging lugs; downward steps are arranged at the inner edges of the left and right box plates of the box body peripheral frame; the hanging lugs on two sides of the frame are laid on the steps of the left and right box plates; the frames are arrayed in the box body peripheral frame from front to back in an equal spacing manner; downwards extending vertical holes are formed in the steps at the lower parts of the hanging lugs; a metal hoop with a rectangular section is hooped on each hanging lug in a sleeving manner; the lower parts of the metal hoops are connected with guide pillars plugged into the vertical holes; and pry rings are arranged at the edges, close to the inner sides, of the upper parts of the metal hoops. When the guide pillar type anti-collision beehive is extracted, stored and transported, mutual collision can be relieved by perpendicular motion, and the service life of each frame is prolonged.

The invention discloses a minitype skid-mounted single-level mixed refrigerant natural gas liquefaction system and a method thereof. The method comprises the steps that natural gas is compressed and cooled by a natural gas supercharge skid; impurities are removed from the natural gas by a deacidification and dehydration skid; the natural gas is cooled by a first stage heat exchanger, then enters a heavy hydrocarbon separator, is cooled and liquefied by a second stage heat exchanger after heavy hydrocarbon is removed, and enters a liquefied natural gas separator after depressurized to liquefied natural gas storage pressure by a throttling valve, so as to form liquefied natural gas; flash steam returns to the heat exchangers to provide cooling capacity; a mixed refrigerant enters a second stage gas-liquid separator after supercharged and cooled by a mixed refrigerant compression skid; the gas phase refrigerant is throttled and cooled after cooled by the two heat exchangers, and provides the cooling capacity for the second stage heat exchanger; and the liquid phase refrigerant is throttled and cooled by the throttling valve after cooled by the first stage heat exchanger, and mixed with the refrigerant from the second stage heat exchanger to provide the cooling capacity for the first stage heat exchanger. The system and the method are simple in a liquefaction process flow and low in energy consumption, facilitate the equipment skidding, and have better adaptability to different gas sources simultaneously.

The invention relates to a well cover with anti-theft and anti-leaping whole structure, and anti-theft method. One blind hole at least, in which fluid sealant filler is poured, is set on the front face of well cover. One chuck petal with convex-down shape at least is set in inner side near the edge of well cover lower part. Chuck groove with horizontal direction, is cut on the side of chuck petal with convex-down shape. Convexity is set in distance on the lower part of circle bearing surface of inner side of well cover bed relative to well cover. The width of Said convexity is corresponding to the one of cut width of said chuck groove. Two exhaust holes is set on well cover or its bed. Chuck petal with convex-down shape of well cover is inserted into the gap of convexity of well cover bed and is rotated so that the all or partial convexity of inner side of well cove bed is embedded into chuck groove with convex-down of well cover. The same color filler is poured in blind hole of well cover. Well cover and its bed, as a whole structure, are clutched with each other, which can prevent well cover from its bed and have the performances such as anti-theft, anti-skid and so on.

The invention relates to an intelligent vertical-compressing brick tea making machine. The intelligent vertical-compressing brick tea making machine comprises a frame body, a tea leaf steaming mechanism, a tea leaf conveying mechanism and a brick tea compressing mechanism, wherein the tea leaf steaming mechanism, the tea leaf conveying mechanism and the brick tea compressing mechanism are arrangedon the frame body; a loose tea inlet and a brick tea outlet are arranged on the frame body; the loose tea inlet is in run-through with the tea leaf steaming mechanism, and the tea leaf conveying mechanism communicates with the brick tea compressing mechanism; the brick tea outlet is in run-through with the brick tea compressing mechanism; a steam generating mechanism is further arranged on the frame body; and the steam generating mechanism is connected with the tea leaf steaming mechanism and the tea leaf conveying mechanism separately. The intelligent vertical-compressing brick tea making machine is intelligent, efficient and safe and is high in degree of automation, good in tea leaf quality and more convenient in cleaning; blanking is accurate, tea leaf accumulation does not occur, heatcompensation is present, and heat loss is low; and cartons are free of shrinking, demolding is easy, brick tea is not damaged, and the brick tea is regular and molded after demolded expansion.

The invention provides a small-scale demolition crowbar for industrial building engineering construction. The small-scale demolition crowbar comprises a crowbar main body, fixing sleeve rings, a fixing pickaxe hammer, a nail nipping head and a lengthened bar body, wherein the three fixing sleeve rings are arranged on the bar body of the crowbar main body at equal distance; the fixing sleeve ringsand the crowbar main body are integrally cast; the crowbar main body consists of a crowbar flat head, a crowbar conical head and reinforcing anti-slip edges; in addition, the crowbar flat head and thecrowbar conical head are respectively arranged at the two ends of the crowbar main body; the fixing pickaxe hammer is inserted and arranged in the fixing sleeve rings; the nail nipping head is fixedon the end part of one end of the crowbar main body through the ring sleeve. The small-scale demolition crowbar for industrial building engineering construction provided by the invention has the advantages that the six reinforcing anti-slip edges are arranged on the outer wall of the lengthened bar body and the crowbar main body in a surrounding array way; in addition, the reinforcing anti-slip edges penetrate through the crowbar main body and the whole bar body structure of the lengthened bar body; the use intensity of the crowbar main body and the lengthened bar body is favorably enhanced; the fracture phenomenon in the prizing process can be prevented.

The invention provides a method for making jasmine tea cake, which comprises the following steps: picking tea leaves, picking green leaves, spreading them, finishing, kneading, baking and drying green leaves, cooling, maintaining fresh flowers, mixing camellia flowers, passing flowers to dissipate heat, starting Flowers, pressed into cakes. The production method of the jasmine tea cake of the present invention makes up for the shortcomings of the original tea leaves such as light aroma and light taste. Fully absorb the fragrance of jasmine, making it more pure and fragrant, with a sweet aftertaste.

The invention discloses a CO2 (carbon dioxide) purifying system and a gas treatment system, and relates to the technical field of CO2 purifying. The CO2 purifying system comprises a raw gas pipeline, a non-adsorbing gas pipeline, a reverse gas bleeding pipeline, a rotary valve and an adsorption tower, wherein the rotary valve comprises a non-rotary part and a rotary part; the non-rotary part is provided with a first flow passage, and the rotary part is provided with a second flow passage; the rotary part is rotated to enable the second flow passage to selectively communicate the raw gas pipeline, the non-adsorbing gas pipeline, the reverse gas bleeding pipeline and the adsorption tower. The gas treatment system comprises the CO2 purifying system. The CO2 purifying system and the gas treatment system have the advantage that multiple pipelines are controlled by one rotary valve, so that the cost is reduced, and the control is convenient.

The invention discloses pliers. The pliers comprise a pliers body. The pliers body is composed of two parts, wherein one part is composed of a handle and a pliers head, and the other part is composed of a handle B and the pliers head. The pliers is characterized in that a bearing shaft is fixed to the connection position of the handle A and the pliers head, and the bearing shaft is connected with a bearing in a sleeved mode; one side of the outer circumference of the bearing is fixedly connected with the connection position of the handle B and the pliers head; the top end of the bearing shaft is further provided with a fixing circular piece which is used for fixing the handle B and the pliers head. Due to the fact that the flexibility of the rotation of the handle A and the handle B is improved, it is more flexible and more convenient for people to use the pliers. Preferably a metal nail is convenient to pry. Preferably it is more convenient for the people to hold the handles with a hand to use the pliers conveniently.

A mine drill stem capable of being rapidly dismounted and connected comprises a drill tail and a drill library, wherein an inner cavity of the drill library and the drill tail are both of a square or hexagonal structure; an inverted-U-type clamping cap is fixedly arranged on the side wall of the drill library so as to form a cavity between the clamping cap and the side wall of the drill library; an insertion block is arranged inside the cavity in a vertical sliding mode and composed of a square limiting block and a pin rod; the square limiting block at the bottom of the insertion block penetrates through the side wall of the drill library and then extends into the inner cavity of the drill library; a clamping block is arranged on the side wall of the top of the square limiting block; the pin rod on the top of the insertion block is perpendicularly arranged in a through hole in the top wall of the clamping cap in a penetrating mode; a compression spring is arranged between the top wall of the clamping cap and the square limiting block and located inside the cavity; a hemisphere used for jacking up the square limiting block is arranged at the end of the drill tail; and under the state that the drill tail is completely inserted into the inner cavity of the drill library, a clamping groove matched with the square limiting block is formed in a rod body of the drill tail in the circumferential direction. According to the mine drill stem capable of being rapidly dismounted and connected, the elastic insertion block is arranged between the drill tail and the drill library to conduct limiting, and rapid dismounting and connection of the drill stem are realized.

The invention discloses a reverse gravitational equilibrium-based six-degree-of-freedom motion platform system, which comprises a control cabinet and a motion execution mechanism, and is characterized in that the control cabinet controls the motion execution mechanism to act to realize the motion of a reverse gravitational equilibrium six-degree-of-freedom platform; the motion executing mechanism comprises an upper platform plate, a lower platform bottom plate, an electric cylinder mechanism, a hydraulic supporting rod mechanism, an energy accumulator and a hydraulic filling device, and the upper platform plate and the lower platform bottom plate are arranged at the two ends of the electric cylinder mechanism and the two ends of the hydraulic supporting rod mechanism respectively and connected with the electric cylinder mechanism and the hydraulic supporting rod mechanism through hinges; when the reverse gravity balance six-degree-of-freedom motion platform system is used, the hydraulic supporting rods are connected in parallel in the middle of the electric cylinders and move along with the six sets of electric cylinders, reverse gravity balance supporting is formed, the effect of balancing part of gravity is achieved, and the reverse gravity balance six-degree-of-freedom motion platform system can achieve better motion characteristics under the condition that the motor power is the same. The safety of the six-degree-of-freedom motion platform is greatly improved, and the six-degree-of-freedom motion platform has the characteristics of novel structure, good safety and convenience in use.

The invention is applicable to technical field of fitness equipment and provides fitness equipment with dual functions of spacewalk and waist twisting. The fitness equipment comprises two support parts and is characterized in that each support part comprises a base and a semi-arc-shaped plate located above the base, one edge of the base is inwardly provided with a sunk semicircular groove, one side, facing the semicircular groove, of the semi-arc-shaped plate is inwardly provided with a T-shaped slide groove, an arc-shaped slide plate corresponding to the T-shaped slide groove is further mounted in the T-shaped slide groove, one end of the arc-shaped slide plate is provided with a plurality of balls, a support plate is upwardly arranged at the other end of the arc-shaped slide plate, a footboard is vertically arranged at the top of the support plate, a baffle is upwardly arranged at one end of the footboard, and the other end of the footboard is provided with a support wheel. The fitness equipment has the advantages that the functions of spacewalk and waist twisting are achieved by the two working states of the fitness equipment, and the fitness equipment is diversified in exercising manner, low in space occupation, capable of being moved at will, capable of being used indoors or outdoors, flexible to use and convenient to maintain.

The invention relates to the field of server debugging auxiliary tool structures, in particular to an M.2 solid state disk pin opening device. The device is designed for an M.2 solid state disk and can be used for quickly disassembling a fixing pin of the M.2 solid state disk. The M.2 solid state disk pin opening device is characterized in that an opening device main body is a V-shaped plate, a prying part is arranged at one end of the opening device main body, a pressing part is arranged at the other end of the opening device main body, a supporting part is arranged at the bottommost part ofa V shape, and a fixing clamping jaw is arranged on the prying part. The whole opening device can open the pin according to the lever principle, and during opening, only the prying part needs to be placed between the cap of the pin and the M.2 solid state disk, and the pressing part is pressed downwards, so that the pin can be pulled up.

The invention discloses a gas decarbonization system and a gas treatment system and relates to the technical field of gas decarburization. The gas decarburization system comprises a raw material gas pipe, a non-adsorbed gas pipe, a reverse exhaust pipe, a rotary valve and an adsorption tower. The rotary valve comprises a non-rotatable member and a rotation member. The non-rotatable member is provided with a first flow path and the rotation member is provided with a second flow path. The rotation member realizes selective communication of the raw material gas pipe, the non-adsorbed gas pipe, the reverse exhaust pipe and the adsorption tower. The gas treatment system comprises the gas decarbonization system. The gas decarbonization system and the gas treatment system utilize the same rotary valve to control the multiple pipes so that a cost is reduced and control is convenient.

A water supply system is described for supplying water to a linearly moving irrigation system. The water supply system is able to take water from a stationary water supply conduit (either a collapsible conduit or a rigid conduit) and feed it into one end of a feed pipe for the irrigation system. The water supply system includes a pickup shoe which extends into the water supply conduit through a traveling opening in the top side of the conduit. The pickup shoe intercepts substantially all of the water in the supply conduit and pumps it upwardly through the traveling opening to the feed pipe for the irrigation system. The pump is located in the portion of the shoe which extends into the supply conduit.

The invention discloses a portable floor tile pinch bar device comprising a pinch bar, a pressing brick plate, a prying disc and a base plate; the outer side of the pinch bar is provided with a connecting sleeve in a sleeving mode, and a fixed sleeve is arranged below the connecting sleeve; the outer side of the fixed sleeve is provided with a supporting plate, and the left side and the right sideof the supporting plate are both provided with spindles; the interior of the pressing brick plate is provided with a pressing brick roller, and the pressing brick plate is arranged below the spindles; the outer surface of the pressing brick plate is provided with a sliding groove; the middle portion of the pressing brick plate is provided with a extending pressing plate, and a pressing block is welded below the extending pressing plate; the left side and the right side of the prying disc are both provided with praying plates, and the outer surfaces of the prying plates are provided with cutting grooves; and idler wheels are arranged below the base plate, and the base plate is located below a rotating stick. The portable floor tile pinch bar device is more labor-saving when prying the floor tile, and can retain the integrity of the floor tile to the maximum limit, so that the floor tile can be used twice and can be moved flexibly during using.

The invention relates to an easily replaceable head brush structure comprising a head, a handle and a button. The button comprises a push portion, a connection portion and an elastic portion; one end of the elastic portion is integrally connected with the connection portion; the other end of the elastic portion is provided with an upper spring plate and a lower spring plate in a V-shaped distribution form; a joint of the push portion and the connection portion is provided with an arc bend; the upper surface of the head and the inner surface of the handle are provided with grooves respectively; the bottom of the connection portion of the button is fitted to the groove arranged in the upper surface of the head; the upper spring plate of the button is fitted to the groove arranged in the inner surface of the handle; the lower spring plate is abutted to the tail end of the groove arranged in the upper surface of the head; a fixing device is arranged inside the handle; one end of the fixing device is connected to the handle; a spring is fixed to the other end of the fixing device; the other end of the spring is abutted to the tail end of the head. The easily replaceable head brush structure is simple in structure, the button can be manufactured at very low cost, the head is convenient to replace, and combination methods are diversified.

The invention provides a wiring module. A bus clamp is provided with a bolt pressing plate assembly arranged at the upper part of the contact piece, and a clamping piece which is arranged at the lowerpart of the contact piece and is suitable for clamping an incoming line busbar; and a bolt pressing plate assembly and a contact piece are opposite to form a wire clamping cavity suitable for clamping an outgoing cable. The bus clamp is connected with the base through a guide structure; the bus clamp can be in sliding connection with the incoming line busbar through a combination structure; and the bus clamp is provided with a first position where the bolt pressing plate assembly abuts against the contact piece, and a second position which can move upwards relative to the contact piece underthe action of the incoming line busbar and the base; during assembly, the incoming line busbar is firstly inserted into the slot on the base; in the insertion process, the bus clamp can move upwards relative to the contact piece under the action of the incoming line busbar and the base guide structure, and then the bolt pressing plate assembly is driven to move upwards relative to the contact piece, so that the space of the wire clamping cavity is enlarged, an outgoing cable can be inserted conveniently, the assembly process is simpler, time and labor are saved, and the labor cost is reduced.

A female terminal fitting (1) includes a tubular portion (14) to receive a rod-like mating terminal (30). Three contact points are on an inner surface of the tubular portion and achieve point contact with an outer surface of the mating terminal (30). One or more resilient contact pieces (18) resiliently contact the mating terminal (30). The contact points (15) are disposed side by side in an outer circumferential direction of the mating terminal (30) when viewed along a center axis (31) of the mating terminal (30). The contact point in the middle is shifted along the center axis (31) with respect to the contact points on both sides in the outer circumferential direction. The resilient contact pieces (18) resiliently contact the mating terminal (30) between the contact points on both sides and the contact point in the middle in the direction of the center axis (31).

The invention relates to the technical field of maintenance and servicing, in particular to a maintenance technology comprising the step 1 of appearance inspection; the step 2 of internal inspection;the step 3 of preparation of a maintenance vehicle; the step 5 of adding of lubricating oil; the step 6 of placement of a steel wire rope; and the step 7 of application of the lubricating oil. Not only the steel wire rope can be maintained, but also the lubricating oil is applied to the surface of the steel wire rope.

The invention discloses a miniature skid type nitrogen expansion natural gas liquefaction system and method thereof. Natural gas is supercharged by a natural gas supercharging prying block and cooled, and enters into a natural gas depickling and dehydrating prying block for removing impurity, and is cooled by a first stage heat exchanger and then enters into a heavy hydrocarbon separator, thereby obtaining a heavy hydrocarbon from the bottom; after the heavy hydrocarbon is removed, the natural gas is cooled by a second stage heat exchanger for liquefaction; after pressure of a throttle valve is reduced to the storage pressure of the liquefied natural gas, the natural gas enters into a natural gas liquefaction separator for obtaining a liquefied natural gas, and a flash evaporation gas returns to the heat exchanger for providing cooling capacity. A nitrogen is supercharged and cooled by a nitrogen compression prying block, and is supercharged and cooled by a two-stage supercharger, and then enters into the first stage heat exchanger for precooling; after precooling, the nitrogen is expanded and refrigerated by the two-grade expander and providing a cooling capacity for liquefaction of natural gas. The miniature skid-mounted type nitrogen expansion natural gas liquefaction has the advantages of simple flow, fast starting and convenient maintenance, and is convenient for prying equipment with low energy consumption, and simultaneously has better adaptability for different gas sources.