48results about How to "Reduce leak points" patented technology

The utility model relates to the technical field of centrifugal pumps, in particular to a novel heavy-load plastic pump which comprises a pump body, a shell arranged on the outer side of the pump body, a bracket arranged on the outer side of the pump body, a shaft body arranged in the center, an impeller arranged on the shaft body, a pump cover and a mechanical seal. A plurality of first double-end bolts and a plurality of second double-end bolts are arranged on the shell, and an inlet clamping ring used for clamping the shell is arranged on the pump body; a first gasket is arranged between the pump cover and the pump body, the pump cover is located between the pump body and the mechanical seal, and a second hexagon bolt of the pump cover is fixedly connected with the mechanical seal. Leakage points are reduced through the design without a shaft sleeve, the plastic pump body is oppositely clamped in a clamping plate mode, the plastic strength is improved, durability is higher, the probability that the pump is damaged due to reverse rotation is reduced by fixing the three first screws on the anti-rotation nut, only the movable ring and the static ring of the mechanical seal make contact with materials, and it is guaranteed that the spring does not make contact with the materials. And the service life of the mechanical seal is prolonged.

The invention discloses a piston pump and a clothes processing device, the piston pump comprises a pump body, a piston and a driving assembly, the pump body is of an integrated structure, and the pump body is provided with a piston cavity; the piston is arranged in the piston cavity in a reciprocating sliding mode in the axial direction of the piston cavity. The driving assembly is connected to the pump body, and part of the driving assembly extends into the piston cavity so as to drive the piston to slide in a reciprocating mode. The pump head is connected to the pump body and provided with a liquid outlet and a liquid inlet which are both communicated with the piston cavity. The pump body is of the integrated structure and is provided with the piston cavity, connecting points can be reduced, and therefore possible leakage points and fault points are reduced, the pump body can bear longer-time use, and the stability and reliability of the whole structure of the piston pump are improved. And one part of the pump body is used as a mounting part of the driving assembly, so that the number of parts of the piston pump is reduced, and the assembly process is simplified.

The utility model discloses a gas circuit control device capable of being used for an airtight test, which comprises a gas source system, a solenoid valve assembly, a precise pressure regulating valve and a gas circuit integrated valve seat, and the top of the gas circuit integrated valve seat is connected with a normally open pneumatic control valve, a normally closed pneumatic control valve, a differential pressure sensor and a direct pressure sensor. An air inlet connector is connected to the right side wall of the air channel integrated valve seat, the air source system is connected with the input end of the electromagnetic valve assembly and the input end of the precise pressure regulating valve, the output end of the electromagnetic valve assembly is connected with the normally-open pneumatic control valve and the normally-closed pneumatic control valve, and the output end of the precise pressure regulating valve is connected with the input end of the air inlet connector. An air channel assembly is arranged in the air channel integrated valve seat. The utility model provides the gas circuit control device capable of being used for the air tightness test, the connectors are few, so that leakage points are reduced, the economical efficiency is good, and the maintenance is convenient.

The utility model provides a differential pressure control valve, and belongs to the technical field of machinery. The problems that the structure is complex and assembling is tedious are solved. The valve body is internally provided with a valve port, the valve sleeve is in threaded connection with the valve body, the pressure adjusting assembly can adjust the opening degree of the valve port, the pressure adjusting assembly comprises a pressure adjusting rod, a spring seat, a diaphragm and a spring, the pressure adjusting rod is provided with a pressure guiding channel, the valve sleeve comprises a sleeve body and a top cover in threaded connection with the top of the sleeve body, and the edge of the diaphragm is fixed between the valve sleeve and the top cover. A first pressure guiding cavity is formed between the diaphragm and the inner wall of the top cover, a pressure guiding opening communicated with the first pressure guiding cavity is formed in the top cover, a second pressure guiding cavity is formed between the diaphragm and the inner wall of the valve sleeve, the spring seat is located in the second pressure guiding cavity, and the two ends of the spring abut against the spring seat and the bottom wall of the inner side of the valve sleeve respectively. And two ports of the pressure guide channel are respectively communicated with the inner cavity of the valve body and the second pressure guide cavity. The device has the advantages of simple structure, convenience in assembly, few leakage points and the like.

The application belongs to the technical field of composite hydrogen storage, in particular to an improved composite hydrogen storage device for hydrogen storage and a use method thereof, which comprises a hydrogen storage tank body and a solid-state hydrogen storage module arranged in the hydrogen storage tank body, the solid-state hydrogen storage module is filled with a hydrogen storage alloy, and an end interface for hydrogen charging and discharging is arranged on an end cover of the hydrogen storage tank body; the solid-state hydrogen storage module comprises a first hydrogen storage unit and a second hydrogen storage unit arranged axially along the hydrogen storage tank body, and a filtering unit arranged between the end interface and the first hydrogen storage unit; the filtering unit is arranged to be slidable, and the pressure difference between the high-pressure area naturally formed between the end interface and the first hydrogen storage unit and the low-pressure area at the bottom of the tank body during hydrogen charging is used as a driving force, during hydrogen charging, the pressure difference drives the filter screen body to avoid the main flow field, thereby reducing the airflow resistance and ensuring high-speed and high-efficiency hydrogen charging.

The invention discloses a low-pulsation low-noise axial plunger pump device which comprises a shell, an oil distribution cover, a main shaft arranged in the middle in the shell, a plurality of plungers distributed in a back-to-back staggered mode along the circumference of the main shaft, an oil distribution disc located in the shell and arranged at the end of the main shaft, a floating cylinder base located on the rear side of the oil distribution disc, a floating cylinder and a limiting sleeve. A pressing plate is arranged between the floating cylinder and the plunger; and a driving pin is arranged between the floating cylinder seat and the main shaft. The number of the plungers is 2-3 times that of a conventional pump, the plungers are back to back and staggered, hydraulic pressure internal force borne by the main shaft can be counteracted, work and operation are stable, the generated pulsation double amplitude is very low, and compared with a traditional plunger pump, the pump is few in leakage point and high in volume efficiency; high-quality flow can be output, and noise is low. The invention has the advantages of simple structure, small occupied space, light weight, lower pressure pulsation and low noise.

The present invention discloses a disposable laparoscopic soft instrument sheath, comprising a main body, a sleeve, a sealing cap, an air intake and exhaust module, an incision expander, a flat ring and an inner ring, wherein four connecting holes, an exhaust hole and an inflation hole are evenly provided on the upper surface of the main body, a sleeve is installed in the connecting hole, a sealing cap is installed on the top of the sleeve, an instrument intake hole is provided at the center of the sealing cap, and the instrument intake hole is used for the entry of surgical instruments; the air intake and exhaust module is arranged on the top of the main body, and the air intake and exhaust module is used for exhausting or transmitting gas to the human body; the incision expander is vertically connected to the bottom of the main body, and an inner ring is arranged on the inner layer of the bottom of the incision expander; the flat ring is arranged on the incision expander, and the incision expander is located above the inner ring. The disposable laparoscopic soft instrument sheath is provided with a sleeve, a main body, an inflation valve and an incision expander as an integral structure, so as to reduce leakage points, avoid interruption of surgery caused by leakage during surgery, and improve surgical efficiency and quality.

The utility model discloses a kind of transformer structures with air layer of box cover, including box cover, air box, hanging plate, pressure release valve and protective baffle, the box cover top is fixedly provided with air box, the inside of the air box is communicated with the bottom of box cover, several hanging plates are fixedly arranged on the air box, the outer side wall of the air box is provided with the pressure release valve being communicated with the inside of air box, the outer side of the pressure release valve is provided with protective baffle, the height of transformer oil tank can be directly reduced, the pressure that oil expansion brings to oil tank caused by the temperature rise of transformer with load is relieved, oil tank processing and assembly are more convenient, transformer product overall appearance is more harmonious and beautiful, operation is safer and more reliable.

The present invention provides an aircraft power source assembly and an aircraft. The aircraft power source assembly includes a motor, a mounting support and an oil tank arranged along the axial direction of the aircraft power source assembly. The motor and the oil tank are fixedly connected to the mounting support, and also includes a pump body, a safety valve, an overflow valve and a first one-way valve. An oil supply channel and an oil return channel are provided in the mounting support, and a pressure supply port and an oil return port are provided on the outer wall of the mounting support. The pump body is arranged on the oil supply channel, and the overflow valve and the safety valve are both connected to the oil supply channel and are both located between the oil outlet end and the pressure supply port of the pump body. The first one-way valve is arranged on the oil supply channel, and the first one-way valve is located between the oil outlet end of the pump body and the overflow valve and is unidirectionally conducted from the pump body to the overflow valve. The aircraft power source assembly can integrate system components inside the power source assembly as much as possible under the premise of completing the function of the hydraulic system, save system installation and system pipelines to achieve aircraft weight reduction, and also reduce the leakage points of the hydraulic system.

The utility model relates to a middle connecting plate of a transmission, the transmission and a vehicle, and the middle connecting plate comprises a middle connecting plate body which is provided with a first shaft through hole and a second shaft bearing mounting hole; the first valve plate and the middle connecting plate body are integrally formed, the first valve plate is provided with a first surface, a plurality of oil cavities are formed in the first surface, and the first valve plate is in surface-to-surface fit with the second valve plate. The first valve plate is integrated on the middle connecting plate body, so that the integration level can be improved, and the lengths of the middle connecting plate and the second valve plate in the thickness direction can be shortened; an oil cavity is adopted to replace a slender oil duct, the oil cavity is small in depth, large in size area, better in castability than the oil duct and good in product casting quality, the first valve plate and the second valve plate are matched in a face-to-face mode, the leakage risk is reduced, the number of the oil ducts in the middle connecting plate body is reduced, and the space occupied by auxiliary holes and a plugging structure and the number of plugging parts can be reduced; the overall dimension of the middle connecting plate is reduced, product cost is reduced, and reliability is improved.

The utility model relates to the technical field of parking air conditioners, and discloses an overhead parking air conditioner with few interfaces, which comprises a shell, an evaporator, a compressor, a condenser and a fan are arranged above the shell, a connecting device is arranged among the evaporator, the compressor and the condenser, and the connecting device comprises a cold connecting part; the cold connecting part comprises an exhaust pipe, a fixing piece and a fixing block. According to the overhead parking air conditioner with the small number of connectors, by arranging the condenser air outlet pipe and the condenser air inlet pipe, the number of connectors compressed through threads is reduced, leakage points are reduced, the number of designed parts is small, meanwhile, the number of welding spots of the device is reduced from six to four, welding is convenient, operators do not need to have very high professional skills, cost is low, and the production period is short; the production efficiency is improved; by arranging the air inlet pipe and the air outlet pipe of the compressor, use of O-shaped gaskets is reduced, and the risks that installation is difficult due to too large compression amount of O-shaped rings caused by too small gaps between the air inlet pipe and the air outlet pipe and leakage is caused due to the fact that the O-shaped rings are easily damaged in the installation process are prevented.

The application discloses a cooling air guide structure, an aero-engine and an aircraft. The aero-engine comprises a centrifugal impeller cover, a radial diffuser, an axial diffuser and a diffuser casing. The diffuser casing is connected to the radial diffuser, the axial diffuser and the centrifugal impeller cover respectively. A chamber is formed between the radial diffuser, the centrifugal impeller cover and the diffuser casing and is close to an outlet of the centrifugal impeller. The cooling air guide structure comprises gas collection channels which are circumferentially and uniformly distributed on the outer periphery of the diffuser casing. The chamber serves as a first gas collection chamber. The gas collection channels are connected to the first gas collection chamber through a first air guide structure so that the gas at the blade tip of the centrifugal impeller outlet is introduced into the gas collection channels through the first gas collection chamber. The gas collection channels guide the introduced cooling air out of the turbine. The cooling air guide structure is an internal channel integrated in the engine. No complex additional pipeline is needed. Compared with the prior art, the weight of the engine is reduced, and the structure is more compact and reasonable.

A vertical long-shaft draining pump structure belongs to the technical field of industrial vertical pumps. The centrifugal pump comprises a base seat, a discharge connecting pipe, an external connecting pipe, a main shaft, a guide vane body, a pump impeller and a flared pipe assembly, the flared pipe assembly comprises a flange, an outer circular flared pipe and an inner circular flared pipe, the flange, the outer circular flared pipe and the inner circular flared pipe are fixedly connected into a whole, the flange is connected with the guide vane body, and the outer circular flared pipe is connected with the main shaft. The outer circular flared pipe serves as an impeller chamber, and the pump impeller is located in the outer circular flared pipe. Maintenance and leakage points can be reduced, flow resistance of an overflowing portion is small, hydraulic efficiency is high, cost is saved, and benefits are remarkable.

The utility model relates to the technical field of detection devices, and discloses an underground coal mine flame-retardant cable copper conductor detection device which comprises a base, an air cylinder is installed below the base, a base is installed at the bottom of the interior of the base, a sample tube base is installed above the base, a sample tube is placed on the sample tube base, and the sample tube is connected with the air cylinder. A connecting port is formed in the upper portion of the interior of the base, the connecting port upwards extends out of the base to be connected with a container type pipeline module, a pressure sensor is installed on the surface of the right face of the container type pipeline module, and an air inlet device is installed on the container type pipeline module. According to the underground coal mine flame-retardant cable copper conductor detection device, through the arrangement of the integrated container type pipeline module and the air cylinder, an instrument automatically installs a sample tube to a connecting port, operation is more convenient, meanwhile, test errors caused by manual installation of the sample tube are avoided, through an integrated container type pipeline, no pipeline connector exists between valves, and the detection efficiency is improved. Gas leakage points are reduced and a temperature field is uniform.

This utility model provides a water tank assembly and a cooking appliance. The water tank assembly includes: a water tank with a receiving cavity; a water guide pipe disposed inside the water tank and communicating with the receiving cavity, the water guide pipe and the water tank being integrally formed; a water outlet pipe extending out of the water tank, the water outlet pipe and the water tank being integrally formed; and a connecting pipe, the water guide pipe being connected to the water outlet pipe through the connecting pipe. The technical solution of this application effectively solves the problems of complex assembly process and high processing cost of water tank assemblies in related technologies.

The invention relates to the technical field of irrigation devices for greenhouses, and discloses an irrigation device for an agricultural planting greenhouse, which comprises a hoisting part fixedly connected to a steel frame structure in the greenhouse in a welding or bolt fixing manner and used for hoisting a sliding rail and an irrigation part moving on the sliding rail, wherein the sliding rail is arranged in parallel along a main beam of the greenhouse, the irrigation part comprises a water pump box sliding front and back on the sliding rail and an irrigation water spraying pipe communicated with the water pump box, a plurality of water spraying points for irrigation are arranged on the irrigation water spraying pipe at intervals, and a water suction pipe is further fixed and communicated to the water pump box. Water supply is achieved through cooperation of the side water channels, the water suction branch pipes and the water suction main pipe, a traditional hose following water supply mode is abandoned, the input cost of a hose sliding supporting device is effectively reduced, and in addition, the weight of equipment hung on a greenhouse steel structure frame is reduced.

A water pipe is arranged on an inner container and communicated with a water storage cavity of the inner container, one end of the water pipe extends out of the inner container, the water pipe is used for supplying water into the water storage cavity or allowing water in the water storage cavity to flow out, a safety valve comprises a main body part and a flange part, and an included angle is formed between the axial direction of the main body part and the axial direction of the flange part; a first water flowing cavity extending in the axial direction of the main body part is formed in the main body part, a second water flowing cavity extending in the axial direction of the flange part is formed in the flange part, the first water flowing cavity is communicated with the second water flowing cavity, and the connecting part is connected between the extending end of the water pipe and the flange part and used for communicating the water pipe with the second water flowing cavity. By means of the safety valve with the turning function, elbow connecting pieces are omitted, water leakage points are reduced, after-sale spare parts are reduced, the cost is reduced, the height size of the whole machine can be reduced, and hidden installation of the water inlet and outlet pipe is better facilitated.

The present invention relates to a fish-shaped fiber Bragg grating large-range pressure sensor, which is suitable for detecting the liquid pressure in a pipeline, and comprises a skeleton, which is composed of two metal sheets arranged symmetrically with each other, and the metal sheets are set as a thin sheet structure that is long in the longitudinal direction and short in the transverse direction. The middle parts of the two metal sheets are respectively raised outwards to form a cavity between the two metal sheets, and an air bag similar to a fish bubble is arranged in the cavity, and a filler is arranged between the air bag and the metal sheet. According to the bionic principle of the fish body, the present invention is designed with a fishbone-shaped metal sheet, and fiber Bragg gratings are arranged on both sides of the inner and outer sides of the central axis of the "fish line" of the metal sheet. Two fiber Bragg gratings on both sides of one metal sheet use the positive and negative deformation principle of the metal sheet to eliminate the influence of temperature on the grating, and realize temperature self-compensated pressure detection; the metal sheet on the other side is provided with a concave or convex rib groove, which plays a role in strengthening the metal sheet's support for the radial elliptical deformation of the fiber Bragg grating, and uses the resonance wavelength splitting relay of birefringence to detect medium and high pressure.

The invention discloses a graphene waste rare and precious metal dissolving reaction kettle device and a dissolving method. The graphene waste rare and precious metal dissolving reaction kettle device comprises a dissolving cavity, a feeding unit, a heating device, an ultrasonic generation device, a pH online monitoring sensor, a temperature online monitoring sensor, a flue gas online monitoring sensor, a discharging unit and a control unit. The inner wall of the dissolving cavity is coated with a graphene-containing anti-corrosion coating, the feeding port is provided with a feeding weight sensor and an adjusting valve, the first liquid inlet is provided with a first liquid inlet flow adjusting valve and a liquid inlet weight sensor, and the second liquid inlet is provided with a second liquid inlet flow adjusting valve and a flow sensor. The heating device and the ultrasonic generating device are suspended in a cavity or fixed on the top cover of the dissolving cavity according to requirements; the bottom double receiving disc guide rails are switched, and an air outlet is provided with a check valve; the control unit is connected with all the sensors and the execution piece, and feeding, temperature control, ultrasonic treatment, liquid drainage, cleaning and end point judgment are automatically completed. According to the invention, efficient dissolution of waste precious and rare metals is realized, automatic operation is realized, and labor intensity and cost are reduced.

The invention discloses a transformer secondary winding and a manufacturing process thereof, comprising a winding U-shaped tube, a die-stamped converging water-cooling groove, a first die-stamped converging water-cooling cover, a second die-stamped converging water-cooling cover, a first output row, a second output row, a first inlet and outlet water nozzle and a second inlet and outlet water nozzle. The top end of the winding U-shaped tube is fixedly connected to the bottom end of the die-stamped converging water-cooling groove, the top end of the first die-stamped converging water-cooling cover is welded to the first output row through holes on the first output row, the top end of the second die-stamped converging water-cooling cover is welded to the second output row through holes on the second output row, the first die-stamped converging water-cooling cover and the second die-stamped converging water-cooling cover are respectively welded to the first inlet and outlet water nozzle and the second inlet and outlet water nozzle. By updating the structure, reducing the cost, reducing the weight, improving the water cooling effect, the welding effect and the conductive effect, excellent transformer performance and transformer working efficiency are achieved, production efficiency is improved, and labor intensity is reduced.

The invention discloses a cup-type oil and gas controller for a liquid fuel stove, comprising a cup body assembly and a cup cover assembly connected to the cup body assembly in a detachable connection mode; the cup body assembly comprises a cup body, an air circuit assembly and an oil circuit assembly, a filter screen is arranged in the cup body, the air circuit assembly comprises an adjusting rod I and an air pipe in a "T"-shaped structure, the air pipe has an air inlet, an air outlet and an adjusting port I, the air inlet, the air outlet and the adjusting port I are interconnected, a conical cavity I is arranged in the air pipe, the large end of the conical cavity I is connected to the adjusting port I, the small end is connected to the air outlet, the air inlet is connected to the side wall of the conical cavity I, and one end of the adjusting rod I has a conical portion I that can cooperate with the conical cavity I. In actual use, the invention has the advantages of convenient connection and maintenance, and can reduce the connection points when connecting between components, thereby reducing the probability of air leakage and ensuring the air tightness of the combustion system.

This invention belongs to the field of welding technology and relates to a welding method for a large-size long girder mold made of nickel-iron alloy, comprising the following steps: 1. Preparing various plates of the mold; 2. Clamping the prepared plates on a machine tool and milling bevels at the joints of the plates; 3. Joining the plates together to form a mold blank, and welding the joints of the plates in layers and passes; 4. Annealing the welded mold blank; 5. CNC machining the annealed mold blank; 6. Inspecting the machined mold.

The utility model relates to the technical field of gate valves, in particular to a multifunctional gate valve which comprises a gate valve shell, a gate plate is arranged in the gate valve shell, and a valve rod used for controlling the gate plate is arranged at the upper end of the gate plate. An automatic cut-off mechanism is arranged at one end of the gate valve shell and comprises a cut-off shell, a cut-off valve seat, a cut-off valve element, an adjusting rod and a self-adaptive spring, the cut-off shell and the gate valve shell are integrally formed, and the cut-off valve seat is arranged at the end, away from the filter cartridge, in the cut-off shell; the cut-off valve element is arranged on one side of the cut-off valve seat, the adjusting rod is arranged in the cut-off valve element, the self-adaptive spring is arranged on one side of the cut-off valve element, and a cut-off sealing face is formed when the cut-off valve element is closed on one side of the cut-off valve seat.

The utility model relates to a swing check valve with a built-in slow-closing structure, which comprises a valve body, a valve clack, a rocker arm, a shifting fork and a valve cover, the rocker arm is connected with the shifting fork through a cylindrical pin, the rocker arm can drive the valve clack to rotate, a slow closing device is arranged in the valve body and comprises a supporting shaft, a support and a hook, and the support is of a hollow structure so that the valve clack can be normally opened and closed. U-shaped holes are formed in the two sides of the support, and the supporting shaft and the hook are placed in the U-shaped holes; an extension spring is arranged between the supporting shaft and the hook; and a sleeve is sleeved below the hook. When the valve is in a working state and the valve clack is converted into a closed state from an open state, the valve clack is slowly closed under the action of self weight, backflow pressure and the acting force of the extension spring, the valve clack is prevented from directly and rapidly falling back to be closed, the water hammer effect is avoided, and the service life of the valve is prolonged.

The present invention discloses a dual-oil fuel manifold, a fuel supply system and an aircraft engine, wherein the dual-oil fuel manifold comprises a first oil pipe, a second oil pipe, an adapter and a connecting nut, wherein the adapter is provided with a first oil passage and a second oil passage; the adapter comprises a first section and a second section, an oil collecting step is formed between the second section and the first section, the end face of the second section is used to enclose a first oil collecting cavity with a fuel nozzle, and the oil collecting step is used to enclose a second oil collecting cavity with the fuel nozzle; the first end of the first oil passage is connected to the first oil pipe, and the second end of the first oil passage is communicated with the first oil collecting cavity; the first end of the second oil passage is connected to the second oil pipe, and the second end of the second oil passage is communicated with the second oil collecting cavity; the connecting nut is sleeved on the adapter and is used to be fixedly connected with the fuel nozzle. The dual-oil fuel manifold provided by the present invention has a simple and compact structure, can simplify the assembly steps, and reduce the risk of oil cross-talk and oil leakage.

This utility model discloses an electrolyzer for a water electrolysis hydrogen production device, comprising a tank body and a sealing cover. A front-end plate is located on the left side of the tank body, and a rear-end plate is located on the right side. Multiple bipolar plates are fixedly arranged at intervals inside the tank body. Between adjacent components—between the front-end plate and the first bipolar plate, between each bipolar plate, and between the last bipolar plate and the rear-end plate—a porous anode electrode, a diaphragm, and a porous cathode electrode are sequentially sandwiched, forming multiple electrolysis chambers. Each electrolysis chamber has an electrolyte inlet at its rear and an anolyte outlet and a catholyte outlet at its front, corresponding to the anode and cathode flow fields, respectively. This utility model provides a short-range, directional flow channel for each reaction unit by setting independent electrolyte inlets and anolyte outlets at the front. This design ensures that the electrolyte can be rapidly and uniformly supplied to each electrode surface, improving current efficiency and saving energy.

The utility model relates to the technical field of feeding device, specifically disclose a kind of electrolytic copper plate vacuum chuck feeding device based on PLC control, including feeding rack, the upper end surface of feeding rack is provided with adsorption mechanism, the adsorption mechanism includes the installation gap of being passed through and being set in the upper end surface of feeding rack, the inside installation of the installation gap is electric trolley, through the sponge vacuum chuck of polyurethane or rubber foamed material with microporous closed cell structure, can let vacuum chuck better contact copper plate, reduce intermediate air leakage point, ensure that vacuum pump is extracted to the vacuum pressure value of requirement setting, copper plate is stably adsorbed, prevent the problem that it does not suck or copper plate falls in lifting process, by adding a time command program in PLC controller, the time, position, operating instruction in whole action process of vacuum chuck can be strictly controlled, reach the time of feeding speed, can adjust the fast and slow of feeding at any time, greatly improve production efficiency.

The present application relates to the technical field of measurement, and particularly provides a true density detection device, which aims to solve the problems of high cost and many leakage points of a true density instrument for realizing positive and reverse air intake. To this end, the present application provides a true density detection device, which comprises an air path module, the air path module comprising a buffer bin, a sample bin and an expansion bin, the buffer bin being in communication with an air inlet and an air outlet of the air path module at the same time, the volume of the buffer bin being smaller than the volume of the sample bin and the expansion bin; the sample bin and the expansion bin are in communication with the buffer bin, and the sample bin and the expansion bin can only be in communication through the buffer bin. Through the above setting, in the case of positive air intake or reverse air intake, the air intake can first enter and fill the buffer bin, and then enter the sample bin. Since the volume of the buffer bin is very small, the pressure difference between the two bins will be quickly balanced, which can effectively avoid blowing up the powdery sample, and there is no need to set a proportional valve, which is conducive to reducing the cost, simplifying the pipeline setting and reducing the leakage points.

The utility model provides an electromagnetic water meter, relates to the technical field of measurement, and is used for solving the technical problem that the electromagnetic water meter and a data terminal are relatively low in mounting and dismounting convenience in related technologies. The electromagnetic water meter comprises a water meter body and a data terminal device, the water meter body is provided with a first data interaction end, the data terminal device is provided with a second data interaction end, the first data interaction end is electrically connected with the second data interaction end, and a sealing structure is arranged between the first data interaction end and the second data interaction end. A socket is arranged on the first side of the water meter main body to form a first data interaction end; the terminal shell is provided with a plug to form a second data interaction end; the plug is electrically connected to the data terminal equipment, the plug is inserted into the socket, the sealing structure is arranged between the plug and the socket, the electromagnetic water meter and the data terminal are convenient to assemble and disassemble, and the sealing performance of the electromagnetic water meter is good.

The utility model relates to the technical field of hydraulic equipment accessories, in particular to an oil path block structure of a hydraulic oil cylinder. The device comprises an oil path block body connected to a hydraulic oil cylinder, a balance valve and a throttling valve are installed on one side of the oil path block body, and a hydraulic lock and a safety overflow valve are arranged on the other side of the oil path block body. A V1 port, a V2 port and an MC2 port are formed in the surface of the front side of the manifold block body, and an MC1 port is formed in the surface of the rear side of the manifold block body. The balance valve, the throttling valve, the hydraulic lock and the safety overflow valve are arranged on the surface of the hydraulic oil cylinder in a centralized mode, the installation size is reduced, an oil way is simple and clear, leakage points are reduced, and therefore the safety of the device is improved.