432 results about "Vertical tube" patented technology

An automatic heat-sealing quality control system to automatically control a quality of a heat-sealing of a sealing strip to a longitudinal edge of a packaging web at a heat- sealing station in a packaging machine, where sealed packages containing pourable food products are continuously produced from a continuous vertical tube filled with the pourable food product and formed by longitudinally folding the packaging web to overlap longitudinal edges thereof and then heat-sealing the overlapping longitudinal edges. The system comprises a visible-light imaging camera designed to operate in the electromagnetic spectrum visible to human eye to capture and output visible-light digital images.

The invention relates to the technical field of piston pump leaking stoppage, and discloses a flow leaking stoppage device for a piston pump, which comprises a leaking stoppage clamp, the leaking stoppage clamp comprises a first clamp component and a second clamp component which are symmetrically arranged, and the first clamp component and the second clamp component are in a T shape rotating 90 degrees anticlockwise. A vertical pipe and a transverse pipe are clamped in the first clamp component and the second clamp component, inner cavities are formed in the first clamp component and the second clamp component, the inner cavities form a complete closed cavity when the first clamp component and the second clamp component are combined, and a first rubber pad is fixedly connected to the inner ring shell wall of the first clamp component and the inner ring shell wall of the second clamp component. After the inner cavity is filled with cooling water, the leaking stoppage clamp forms a wrapping type cooling clamp, the cooling effect on the pump cavity is achieved, the possibility that the sealing effect is reduced and water leakage is caused due to the fact that the temperature of the pump body is too high and the rubber sealing piece is thermally deformed is reduced, the leakage risk is reduced, and the service life of the piston pump is prolonged.

The invention relates to the technical field of fire-fighting valves, in particular to a marine fire-fighting valve with a double-sealing structure, which comprises a fire-fighting valve main body, a ball cavity is formed in the fire-fighting valve main body, a spherical valve device is arranged in the ball cavity, and one side of the spherical valve device blocks a transverse pipe cavity formed in the fire-fighting valve main body. The fire valve comprises a fire valve body, a spherical valve device is arranged in the fire valve body, the adjacent side of the spherical valve device blocks a vertical pipe cavity formed in the fire valve body, the two sides of the spherical valve device are both connected with direction adjusting shafts driving the spherical valve device to rotate, one side of each direction adjusting shaft is in transmission with a leading-in worm correspondingly, and a manually-adjusted main shaft is arranged in the fire valve body. A door is arranged at a port of each pipeline to limit one-way flow of fluid, the fluid flowing through the fire valve in any direction can be intercepted, and the L-shaped water pipe is communicated between the transverse pipe cavity and the vertical pipe cavity by controlling the ball frame to rotate by half circle, so that a fire valve channel is opened, and the fire valve can convey the fluid.

This invention relates to the field of injection molding machine technology, specifically to an anti-clogging structure and injection molding machine for an injection molding machine. The structure includes a vertical tube and a pressure relief pipe inserted into the middle of the vertical tube. The vertical tube is fixedly installed inside a conical head. This anti-clogging structure and injection molding machine can lift the end cap upwards when blockage occurs at the end of the barrel, connecting the vertical channel with the axial channel to relieve pressure inside the barrel and prevent blockage, thus avoiding oil leakage or cylinder explosion. When the end cap moves upwards, it pulls the sealing pipe through a connecting ring and a transmission mechanism, opening the guide channel and ensuring that the extruded molten plastic can re-enter the barrel from the end of the guide channel, achieving internal filling of the barrel and ensuring continued operation of the equipment. Simultaneously, to relieve pressure, a locking block supports the bottom of the connecting ring, ensuring that subsequent cylinder extrusion does not require further force to lift the end cap upwards.

The invention relates to the technical field of heat exchangers, in particular to an axial tube plate module combined heat exchanger and a working method.The heat exchanger comprises two end sockets, a plurality of axial tube plate modules sequentially arranged in series, a first medium inlet, a first medium outlet, a second medium inlet and a second medium outlet, the axial tube plate module comprises a shell, two vertical tube plates arranged in parallel in the axial direction of the shell and a plurality of first heat exchange tubes penetrating through the vertical tube plates, the shell is divided into a middle shell pass cavity and two side tube pass cavities through the two vertical tube plates, partition plates are arranged at the ends of the tube pass cavities, and communicating holes are formed in part of the partition plates, so that shell pass flow channels are sequentially communicated in the multiple modules. Forming a serpentine flow path of the first medium; the shell pass cavities of the adjacent modules communicate with each other to form a second medium flow channel, each axial tube plate module is equivalent to an independent heat exchange unit, multi-stage heat exchange is achieved in a single device through a modular structure, multiple devices and external pipelines are not needed, the heat exchange efficiency is remarkably improved, and the structure is simplified.

The utility model relates to the technical field of scanning arrays, in particular to a near-field holographic scanning array which comprises a vertical pipe, a plug block, a plurality of supports, a plurality of auxiliary frames and a plurality of hydrophones. The supports are detachably arranged at the lower end of the vertical pipe through the plug blocks and distributed around the axis of the vertical pipe. The plurality of hydrophones are distributed on the support through the auxiliary frame, the auxiliary frame is connected with the support in a sliding mode, and the near-field holographic scanning array can be conveniently disassembled, assembled and transported through the near-field holographic scanning array.

The utility model discloses a wrench rotating umbrella base which comprises an installation base, an inner vertical pipe, an outer vertical pipe and a locking structure. And the inner vertical pipe is fixed on the mounting base. And the outer vertical pipe is sleeved outside the outer ring of the inner vertical pipe and is in running fit with the inner vertical pipe. A locking structure is disposed between the inner riser and the outer riser. According to the utility model, a locking structure that the wrench is meshed with the fluted disc is adopted between the inner vertical pipe and the outer vertical pipe, so that locking and unlocking operations of rotation are realized, a user can unlock the outer vertical pipe without treading by feet while driving the outer vertical pipe to rotate left and right, and the operation convenience is improved. Meanwhile, the torsion spring is arranged on the wrench, so that when the user cancels the pressure applied to the wrench, the torsion spring drives the wrench to automatically reset and is engaged and locked with the fluted disc, and the operation convenience is improved.

The present application relates to anthocyanin extraction technical field, disclose a kind of berry anthocyanin extraction equipment and extraction method, extraction equipment includes: extraction machine, the working area of extraction machine is provided with fruit juice cold filtering mechanism, for cold treatment berry and realize efficient extraction;Fruit juice cold filtering mechanism includes four vertical setting mid vertical tube, cloth bag and supply suction liquid component;Wherein: four mid vertical tubes are fixed in matrix in the center position of extraction machine working area, form stable support structure;Mid vertical tube top and limiting disc form rigid connection, bottom is fixedly arranged bottom disc by welding mode;Supply suction liquid component is connected with four mid vertical tubes;Limiting disc is rotatably provided with bevel gear disc outside by bearing assembly, form rotary drive structure;The present application is by setting fruit juice cold filtering mechanism, using 0 to 5 ℃ low temperature extraction liquid and pure water form high pressure cold vortex flow, while physically crushing berry, effectively avoid the damage of high temperature to anthocyanin activity.

The utility model discloses a seedling puncher, and belongs to the technical field of punchers. Comprising a supporting frame, a conical head is fixed to the lower end of the supporting frame, the lower end of the conical head is a tip end part, the lower end of the supporting frame is elastically connected with an annular plate, the annular plate and the conical head are coaxially arranged, and the annular plate is in threaded connection with a plurality of long screw rods; the conical head comprises an inverted frustum, a vertical pipe coaxially fixed to the frustum and a conical head coaxially fixed to the vertical pipe, and the technical effect that the hole diameter of punched holes is adjusted so as to be suitable for different seedling raising and sowing is achieved.

The utility model relates to a full-folding magnetic control vehicle which comprises a main body, folding supporting legs are arranged on the lower side of the main body, the folding supporting legs are located on the lower side of the main body after being folded, a fixing piece is arranged on the front side of the main body, a folding vertical pipe is arranged on the upper side of the fixing piece, and a folding handle is arranged on the upper side of the vertical pipe. The folding pedals are arranged on the left side and the right side of the body respectively, the telescopic seat tube is arranged on the upper side of the body, the seat cushion is arranged on the upper side of the telescopic seat tube, the supporting feet, the vertical tube, the handle and the pedals are all arranged to be of a folding structure, and then the seat tube is arranged to be the telescopic seat tube. The supporting feet, the vertical pipe, the handle and the pedal can be folded to be close to the main body position, then the telescopic seat pipe moves downwards to be close to the main body position, a plurality of parts of the magnetic control vehicle can be folded, the occupied space is reduced, and transportation is convenient.

The utility model relates to a front folding type sliding plate type electric vehicle which comprises a sliding plate sectional material, a front fork sleeve fixedly connected to the front end of the sliding plate sectional material, rear shaft fork plates fixedly connected to the two sides of the rear portion of the sliding plate sectional material and a battery body detachably connected to the upper portion of the sliding plate sectional material. And the sliding plate profile can be folded towards the sliding plate profile. According to the frame structure of the small wheel sliding plate type electric vehicle, the battery and the cushion can be flexibly detached according to use requirements, only the vertical pipe needs to be folded and pressed towards the rear wheel when the frame structure is folded, rapid folding can be achieved, folding is convenient and rapid, and the frame structure can be easily operated and used by one person. Meanwhile, the structure is reasonable and compact after longitudinal folding, space can be effectively saved, extra space of a trunk is not occupied, convenience can be brought to a user to carry the bicycle when the user goes out, and high application and popularization value is achieved.

The utility model provides a vertical pipe assembly of a bicycle. The vertical pipe assembly of the bicycle comprises a handle seat, a base and a locking component, the handle seat is provided with a first sleeve hole formed at one end of the handle seat, a packing part formed at the other end of the handle seat and a pivoting part formed between the first sleeve hole and the packing part. The base is arranged on the pivoting portion of the handle seat, and the handle seat can rotate relative to the base. The locking assembly is arranged on the pressing portion of the handle seat and provided with a main operation handle, an auxiliary operation handle pivoted to the main operation handle and a locking piece connecting the main operation handle and the auxiliary operation handle, and when the auxiliary operation handle and the locking piece are not connected in an abutting mode, the main operation handle can rotate relative to the locking piece. Therefore, the handlebar rotates relative to the base through the handlebar seat, and the handlebar can be converted into the storage state from the use state.

The utility model belongs to the technical field of seats, and particularly relates to a vehicle seat headrest rotating and folding mechanism which comprises a headrest assembly, a supporting vertical pipe and a transverse shaft fixed at the upper end of the supporting vertical pipe, a box body is hinged on the transverse shaft, the headrest assembly is fixed on the box body, and a locking block with a locking groove is fixed on the transverse shaft in the box body. A middle shaft and a control shaft are sequentially arranged above the transverse shaft in the box body from bottom to top, the upper side of a cantilever hinged to the middle shaft is concave downwards to form a control groove, a locking block extending downwards is arranged on the lower side of the cantilever, an unlocking pawl is fixed to the control shaft, the locking block is clamped into the locking groove, and the unlocking pawl is clamped into the control groove. The rotating control shaft drives the unlocking pawl to rotate, the unlocking pawl drives the cantilever to rotate so as to enable the locking block to leave the locking groove to be unlocked, the headrest assembly is rotated to a set limiting angle, and the headrest assembly is turned to a reset position to be locked. The automobile seat has the advantages that after the headrest assembly is lowered, the sight of a driver is not affected, a seat is put down without mutual interference, and operation is convenient.

This application relates to a connection structure between the car frame and the car bottom of a backpack frame lifting platform, including a car bottom welding assembly and a lower beam welding assembly. The car bottom welding assembly includes a car bottom plate and several connecting vertical tubes disposed within the car bottom plate. The lower beam welding assembly includes a support frame, lower beam cantilever arms disposed on both sides of the support frame, bottom angle steel disposed on the lower beam cantilever arms, connecting side tubes disposed on both sides of the support frame and connected to the bottom angle steel, and at least one connecting central tube disposed in the middle of the support frame. The connecting central tube, connecting side tubes, and connecting vertical tubes are detachably connected. By setting up the car bottom welding assembly, the lower beam welding assembly, and the detachably connected connecting vertical tubes, connecting side tubes, and connecting central tubes, a split splicing connection between the car frame and the car bottom is achieved, thereby avoiding the wear and damage problems caused by integral structures during transportation, and making installation, maintenance, and parts replacement more convenient, solving the problem of lack of flexibility in the integral connection structure of the prior art.

The utility model provides a bicycle handlebar vertical pipe which comprises a front fork assembly, a middle pipe, an upper cover, a mandrel, a left side cover, a right side cover, a first conical head screw, a spring, a second conical head screw and a screw rod. The bicycle handlebar stand pipe has the advantages that the bicycle handlebar stand pipe is simple in structure, fine adjustment of the installation angle of the middle pipe and the bicycle handlebar can be achieved by adjusting the adjusting protruding strip arranged on the stand pipe and the adjusting groove formed in the mandrel, operation is safe, different requirements of a rider can be met, practicability is high, and popularization is easy. The bicycle handlebar vertical tube structure is simple in structure, convenient to use, simple to operate, low in cost and easy to popularize, the bicycle handlebar vertical tube structure can be combined with a bicycle by inserting the vertical tube into a front fork hole of the bicycle and sleeving the front fork upper tube with the outer diameter of a front fork rod of the bicycle, and adjustment can be carried out only by screwing a conical head screw to open the side cover, and the bicycle handlebar vertical tube structure is simple to operate, low in cost and easy to popularize.

A safety anchoring device for high-position edge operation comprises a supporting pipe, a blocking pipe vertically arranged on the supporting pipe and an adjusting connecting assembly arranged on the supporting pipe in a sliding mode. The adjusting connecting assembly comprises an adjusting pipe arranged on the supporting pipe in a sleeving mode, first connecting holes are formed in the adjusting pipe and the supporting pipe, a plurality of first connecting holes are distributed in the supporting pipe, limiting bolts are detachably arranged in the first connecting holes of the adjusting pipe, and the adjusting pipe can be connected with any first connecting hole in the supporting pipe through the limiting bolts. A vertical pipe is arranged on the top face of the adjusting pipe, a hook is arranged on the vertical pipe, and a limiting pipe is arranged on the bottom face of the adjusting pipe. According to the anchoring device, the blocking pipe and the adjusting connecting assembly are arranged on the supporting pipe, the adjusting connecting assembly can be used for adjusting the position on the supporting pipe, clamping and fixing of the anchoring device on a wall are achieved, then a constructor connects a safety rope to the adjusting connecting assembly, and the construction safety of the constructor is improved.

The utility model relates to the technical field of fences, and discloses a slide rail type assembled fence which comprises two transverse pipes, one sides of the transverse pipes are fixedly connected with slide blocks, the outer portions of the two slide blocks are connected with a plurality of vertical pipes in a sliding mode, buckling grooves are formed in the sides, away from the transverse pipes, of the vertical pipes, and buckling rings are arranged on the inner walls of the buckling grooves. A buckle plate is fixedly connected to one side of the buckle ring, two inserting columns are fixedly connected to the side, close to the transverse pipe, of the buckle plate, the inserting columns and the transverse pipe are in a clamping relation, the inserting columns and the sliding blocks are in a clamping relation, and limiting assemblies used for preventing the inserting columns from sliding out of the range are fixedly connected to the outer portions of the inserting columns. And a spring is arranged outside the inserting column in a sleeving manner. By means of the design, the distance between the vertical pipes can be adjusted according to the requirements of customers, and due to the fact that installation is convenient and fast, and the size is small after disassembly, the transportation cost is reduced.

The utility model discloses a convenient-to-use best machine, and the technical scheme well solves the technical problems that the best machine can be moved only after being lifted, so that the best machine is labor-consuming, and the height and the use angle of a display are fixed and cannot be well adjusted according to the use scene, so that the best machine is not convenient to use. Comprising a bottom plate and a display body, a vertical pipe is arranged above the bottom plate, a mounting hole is formed in the position, close to the rear side, of the top of the bottom plate, and the bottom end of the vertical pipe extends into the mounting hole. The height of the displayer body can be adjusted up and down to a certain extent when the displayer body is used, the displayer body can rotate leftwards or rightwards through the supporting arm, the displayer body can be rotated when the displayer body is used, and in addition, the whole displayer body can be moved freely without lifting the bottom plate through the universal wheels; and the use convenience can be effectively improved.

This invention belongs to the technical field of evaporation separation equipment, and particularly relates to a vertical tube falling film evaporation device with coupled gas-liquid path separation. It includes a vertically arranged shell closed at both ends, with at least one heat exchange tube inside the shell. An upper end cap is connected to the top of the shell, and a lower end cap is connected to the bottom. The lower end cap communicates with the heat exchange tube. A liquid distribution and separation buffer chamber is formed between the upper end cap and the top of the shell, and a liquid distributor communicating with the heat exchange tube is provided inside the chamber. The liquid distributor includes a liquid distributor connecting pipe, the interior of which is an outlet channel. A thickened outer circumferential wall is provided at the top of the heat exchange tube in the lower circumferential direction. Multiple spiral liquid inlet channels are evenly spaced on the outer side of the thickened outer circumferential wall. The top of the channels communicates with the liquid distribution and separation buffer chamber, and the bottom communicates with the heat exchange tube, with the side openings blocked by the inner wall of the heat exchange tube. The material forms a liquid film through the spiral liquid inlet channels. After the heat exchange medium heats the material, the evaporated gas is discharged through the outlet channel, and the concentrated material enters the lower end cap, achieving efficient gas-liquid separation and uniform liquid distribution.

The invention relates to the technical field of gas separation, and discloses a separation device for coal mine gas extraction, which comprises an upper separation tank body and a lower separation tank body which are communicated with each other, and the upper part of the upper separation tank body is provided with an extraction pipeline access pipe and an exhaust pipe; the spiral separation mechanism is used for separating gas and comprises a spiral plate, a vertical pipe is installed in the spiral plate, a spiral downward separation space is formed between the spiral plate and the vertical pipe, and the upper end of the separation space is sealed through a sealing plate; and the inclined separation filter frame is used for separating coal cinder. Mixed fluid can enter the separation space in the tangential direction and rotationally move downwards, slag and water are made to be prior to sedimentation of gas, fine coal slag and small water drops with small particle sizes in the gas can be centrifugally separated out, the gas discharged into the separation space can float upwards through the vertical pipe to be discharged, and the gas separation efficiency is improved. Therefore, fine coal cinder and small water drops with small particle sizes in the gas can be effectively separated.

The invention discloses a bicycle seat post linkage folding frame which is used for assembling a folding bicycle and the like, can be carried to a bus, a subway or a train, and is not cumbersome. A front frame (3), a rear frame (13) and a seat post (8) share a pedal center shaft assembly (9) to be rotationally folded; in addition, an energy storage telescopic mechanism (26) is designed to realize automatic folding; when a folding bicycle is installed by using the bicycle saddle, the bicycle can walk by only grabbing the saddle tube (8) with hands; when the folding device needs to be used on a subway or a train, a handle (21) of the self-locking folding device is pulled, the front vertical pipe (2) is folded, the front wheel (1) and the rear wheel (14) are folded together, and the minimum folding effect is achieved. Therefore, the knapsack can become a carry-on tool for riding instead of walk for the majority of users.

The utility model relates to the technical field of inflating devices, and discloses an inflating device for assembling an air film building, which is characterized in that a centrifugal fan, a venturi tube, a vertical tube and the like are arranged to accelerate the flow velocity of air and introduce other air, and an air inlet of the air film building is hermetically connected with a diffusion section by using devices such as a connecting tube and the like. Then a centrifugal fan and a frequency converter are started, a fan body sucks in external air through an air inlet pipe and blows the external air into an air outlet pipe, the air outlet pipe transmits wind power into a Venturi pipe, then the wind power is compressed through a storage section to enable the wind power to rapidly flow when reaching a throat pipe section, and meanwhile air in a vertical pipe is introduced into the venturi pipe; and the air volume and the air speed blown into the air film building are increased, and the effect of rapidly blowing more air is achieved.

This invention belongs to the field of enameled wire processing technology, specifically relating to an enameled flat wire production apparatus. It includes a housing, inside which a first partition divides the housing into an upper chamber and a lower chamber. A vertical tube is fixed to the first partition, penetrating it. A varnish supply pipe is connected to the side of the vertical tube, extending beyond the housing. When a conductive wire core passes through the vertical tube, a gap exists between the conductive wire core and the inner wall of the vertical tube. A first rubber stopper is provided on the bottom surface of the housing, penetrating the bottom surface and having a first through hole. When a conductive wire core passes through the first rubber stopper, it adheres to the inner wall of the first rubber stopper. A second rubber stopper is provided on the top surface of the housing, penetrating the top surface and having a second through hole. When a conductive wire core passes through the second rubber stopper, it adheres to the inner wall of the second rubber stopper. This enameled flat wire production apparatus offers relatively low production difficulty in producing enameled flat wire.

The invention relates to the technical field of condenser tube expansion, in particular to a vertical tube expander which comprises a rotating table, a base of the rotating table is fixed to the upper portion of a mounting frame, a stabilizing table is fixedly connected to the top face of the rotating table, a top seat is fixedly mounted on the upper portion of the stabilizing table, and the top of the top seat abuts against the lower portion of a condenser body. A guide assembly is arranged over the condenser body, and a pipe expanding head is arranged in the guide assembly. The pipe expanding head in the guide assembly is driven by the rolling assembly to move downwards, so that the lower end of the pipe expanding head is inserted into the expanding pipe above the condenser body, the condenser body is stabilized through the clamping piece, and meanwhile, the condenser body is supported under the cooperation of the stabilizing table and the top seat. And when the rotating table is started, the mounting framework rotates by 90 degrees above the mounting frame to replace the condenser body clamped in the clamping piece on the other side, so that the tube expansion method of the top copper tube of the condenser body can be alternately replaced, and the tube expansion efficiency of the top copper tube of the condenser body is improved.

The utility model discloses an integrated seat tube of a bicycle, and particularly relates to the integrated seat tube of the bicycle. Comprising a vertical pipe body and a horizontal mounting part, the vertical pipe body and the horizontal mounting part are integrally formed by seamless metal pipe fittings, the horizontal mounting part is of a continuous arc-shaped structure, and a plurality of through holes are formed in the horizontal mounting part and used for reducing weight and assembling and fixing. According to the integrated seat tube, more compact design is achieved through extrusion forming, unnecessary parts and joints are reduced, the overall structure is more concise and smoother, the defects that the strength and rigidity of a seat tube structure connected through welding or screws are not enough are overcome, various stresses in the riding process can be better borne, and the cost is reduced by reducing the unnecessary parts. The seat tube can be mounted and adjusted simply, conveniently and quickly only through simple quick disassembly or fixation, more stable support can be provided during riding, shaking of the seat tube is reduced, and riding comfort and controllability are improved.

The utility model relates to the technical field of food processing equipment, in particular to a high-pressure egg marinating device which comprises an outer tank, a discharging pipe fixedly installed at the bottom end of the outer tank, a ball valve fixedly installed on the discharging pipe, an external electric heater fixedly installed outside the outer tank and used for temperature control heating, and a top cover assembly arranged at the top of the outer tank and used for sealing. An inner mesh barrel which is integrally in a mesh barrel shape is arranged in the outer tank, a vertical pipe is fixedly installed at the bottom end of the inner mesh barrel, the tail end of the vertical pipe is inserted into a valve body of the ball valve and does not affect rotation of a valve element of the ball valve, and a brine filling gap is formed between the inner mesh barrel and the outer tank. And the inner mesh cylinder is used for circulating the marinating liquid and preventing the eggs and marinating materials from falling out to the marinating liquid filling gaps. The marinating and discharging device is convenient to marinate and discharge, and is convenient to use.

The utility model relates to the technical field of unmanned aerial vehicle tail cover assembling equipment, in particular to unmanned aerial vehicle tail cover assembling equipment which comprises a bottom frame, multiple sets of vertical pipes are assembled on the surface of the top end of the bottom frame, vertical cylinders are installed on the inner sides of the vertical pipes in a sliding mode, and frames located on the tops of the vertical pipes are assembled among the multiple sets of vertical cylinders. An electric push rod A used for pushing the vertical cylinder to ascend and descend is assembled in the vertical pipe. When the equipment for assembling the tail cover of the unmanned aerial vehicle is used, an electric push rod A in a vertical pipe at the top of a bottom frame can operate according to use requirements, the electric push rod A operates to conveniently push a vertical cylinder in the vertical pipe, so that the vertical cylinder ascends and descends under thrust and drives a frame to move, and the height of the frame is conveniently adjusted; and the height of the fixture at the top of the frame is changed accordingly, workers can conveniently use the fixture, and the unmanned aerial vehicle tail cover can be conveniently assembled.

The present application relates to the technical field of outdoor leisure wagons, and in particular to a wagon and a rear push handle collapsing mechanism thereof. The rear push handle collapsing mechanism comprises a horizontal tube and two vertical tubes; one end of the horizontal tube is hinged to one of the vertical tubes; the other vertical tube is further provided with a bending section; and the other end of the horizontal tube is inserted into the bending section. The rear push handle collapsing mechanism uses the form in which the horizontal tube is inserted into the bending section, such that convenient mounting and dismounting are achieved, and the whole rear push handle is structurally stable and not prone to shake upon the completion of insertion of two tubes; and when collapsing, the horizontal tube is pulled out and folded to complete collapsing, thereby achieving simple and convenient operation and not affecting the collapsing of the whole wagon.

This utility model discloses a test tube shaking device for geochemical testing, comprising: a U-shaped base with multiple arc-shaped protrusions evenly spaced on its bottom inner wall; a U-shaped support with four rollers rotatably mounted on its rectangular bottom, the rollers making movable contact with the bottom inner wall of the U-shaped base and cooperating with the arc-shaped protrusions; and a test tube insert sealing and positioning anti-detachment plug assembly installed on the U-shaped support. This utility model, through a series of structures, facilitates the safe positioning of multiple test tubes and the simultaneous and safe sealing and anti-detachment of multiple test tube plugs, preventing the test tube plugs from detaching during shaking. It also facilitates single-drive, integrated, bidirectional reciprocating shaking of multiple vertical tubes. Utilizing this bidirectional reciprocating vibration method, it significantly increases the vibration interference of the liquid inside the test tubes, improving the mixing effect and efficiency of the liquid. Combined with the safe sealing and anti-detachment of multiple test tube plugs, it ensures the safety of the shaking operation.

The invention discloses a CFD (Computational Fluid Dynamics)-based simulation analysis method for flow and evaporation characteristics of a falling film of a microstructure vertical pipe. According to the method, a geometric model is firstly constructed, grid local encryption and independence verification are carried out, then a control equation set containing continuity, momentum, energy and component transportation is constructed, an interface phase change model based on Rankine-Hugoniot jump conditions is particularly introduced, mass and energy transfer of a gas-liquid interface is accurately calculated through a user-defined function, and the gas-liquid interface phase change control method based on the Rankine-Hugoniot jump condition is obtained. And finally analyzing the film forming characteristic, flow field distribution and evaporation performance of the liquid film through post-treatment. According to the method, the physical mechanism of the microstructure induced secondary flow and the reconstructed thermal boundary layer can be analyzed, the heat transfer enhancement effect of different microstructures can be quantitatively evaluated, and the problem that a traditional empirical formula cannot predict the microstructure enhancement mechanism is effectively solved; and a low-cost and high-efficiency virtual experiment platform is provided for the optimal design of the high-performance vertical falling film evaporator.