37 results about "Injection force" patented technology

The invention relates to the technical field of automobile part manufacturing equipment, in particular to an automatic production line for producing reversing radar terminal seats, which comprises a supporting seat, conveying frames are symmetrically and fixedly connected to the outer surfaces of the two sides of the supporting seat, a conveying belt is rotatably connected to the top of each conveying frame, and the conveying belt is driven by a motor to operate. According to the automatic production line for producing the reversing radar terminal base, when a through hole in the bottom of a first inserting pipe is aligned with a through hole in the bottom of a second inserting pipe, an injection molding raw material is instantly poured into a mold cavity of a mold cavity plate through the aligned through hole under the action of pressure, so that a quick injection force is provided for the injection molding raw material during injection molding; the speed of injection molding raw materials entering the mold cavity is greatly increased, the flowability of the injection molding raw materials is improved, blockage is avoided, and meanwhile the problem of defective products caused by injection molding dead angles in the mold cavity due to insufficient pressure value during injection molding can be greatly solved.

The utility model belongs to a spraying device, and provides a supersonic spraying device, a non-invasive spraying device and a spraying instrument.The problems that spraying is not uniform and operation is inconvenient still exist in an existing instrument, and the supersonic spraying device, the non-invasive spraying device and the spraying instrument.The supersonic spraying device comprises a liquid section, a gas inlet section, a contraction section, a throat part and an expansion section, and the gas inlet section, the contraction section, the throat part and the expansion section are coaxially and sequentially connected; liquid enters from the liquid section, gas is accelerated through the contraction section, reaches the throat part and is continuously accelerated at the expansion section, the liquid entering from the liquid section is atomized under the action of the gas at the throat part, is brought into the expansion section and is finally sprayed out from the spraying opening along with continuous acceleration, and the uniform spraying effect is achieved. According to the supersonic jet device, the ratio of the axial length L1 to the axial length L2 is designed, the structure of the supersonic jet device is further optimized, and actual verification shows that under the optimized ratio, the jet force of the supersonic jet device is obviously improved, the particle size and the jet range of jetted liquid drops are better, and the flow speed of the liquid drops is more stable.

Disclosed in the present invention is an injection device for a pipe ice-slurry cleaning system. The injection device is mounted on a remotely-controllable movable cleaning body that can move within a pipe, the injection device comprising a nozzle outlet core (1), an outer sleeve (2), a regulating core (3), a connecting inner cylinder (4), a connecting tube (5), a first swirling pressure regulating body (6) and a second swirling pressure regulating body (7), wherein the nozzle outlet core is mounted at the left end of the outer sleeve, the right end of the outer sleeve being mounted on the connecting tube. The injection device is characterized in that the regulating core and the connecting inner cylinder are mounted in the outer sleeve and located between the nozzle outlet core and the connecting tube; the first swirling pressure regulating body and the second swirling pressure regulating body are connected to an inner peripheral wall of the connecting inner cylinder; and the axial position of the regulating core is adjustable. The regulating core, the first swirling pressure regulating body and the second swirling pressure regulating body are used for regulating the particle size uniformity, mixing uniformity and swirling performance of an ice slurry / ice particle liquid mixture, thus improving the injection force of the injection device, and thereby improving the cleaning effect of the ice slurry liquid mixture on a pipe inner wall.

The present invention discloses a dual accumulator oil passage system for a die casting machine, which belongs to the technical field of die casting machine control. The dual accumulator oil passage system includes an injection cylinder and an accumulator, and further includes a booster accumulator. The booster accumulator includes a booster chamber and an annular chamber. The booster chamber is connected to a rodless cavity of the injection cylinder. The accumulator is connected to the annular chamber of the booster accumulator via a first servo valve. The annular chamber is connected to an oil tank via a second servo valve. The rod-equipped cavity of the injection cylinder is connected to the oil tank via a third servo valve. In this technical solution, the first and second servo valves form an A-bridge control for the boost accumulator, and by controlling the pressure in the annular chamber of the boost accumulator, the magnitude of the boost injection force of the injection cylinder can be controlled. The third servo valve can control the oil discharge from the rod-equipped cavity of the injection cylinder, thereby controlling the injection speed of the injection cylinder. This technical solution can achieve accurate control of the injection speed and injection force by using only three servo valves.

The present invention belongs to the technical field of mechanical connection, and relates to a new type of hanging connector for detecting the pulling force of a control rod assembly, including a locking rod and a locking claw; one end of the locking rod is provided with a first conical surface; the other end is provided with an external thread; the locking claw is sleeved on the locking rod; one end of the locking claw is provided with a plurality of circumferentially distributed elastic claws, and the elastic claw is arranged in the inner hole of the control rod assembly; the inner side of the elastic claw contacts the first conical surface; the locking rod is also provided with a locking nut, the locking nut cooperates with the external thread, and the locking nut is arranged on one side of the locking claw; the locking rod is driven to move in the locking claw by rotating the locking nut, and the elastic claw is driven to open or contract through the first conical surface, so that the elastic claw contacts or separates from the inner hole wall of the control arm assembly. The connector in the present invention adopts a self-centering conical elastic self-locking to avoid the swing and torsion of the control rod assembly, and the overall structure is exquisite and simple, low cost, safe and reliable.

The present invention discloses a recyclable precision injection push device, comprising: a housing; a scale ring spirally lifted relative to the housing; an injection component for applying an axial injection thrust; the injection component comprises a pressing cap and an injection force transmission sleeve connected to each other, and a push rod for pushing the piston of a medicine bottle to move; a transmission component for transmitting the injection thrust of the injection component to the push rod; the transmission component comprises a rotating cylinder, a driving sleeve and a motion conversion sleeve; the rotating cylinder is located below the injection component, and the rotating cylinder and the injection component are axially linked; the driving sleeve is located below the rotating cylinder, and the end face of the rotating cylinder opposite to the driving sleeve is provided with a first end face gear ring, and the upper end face of the driving sleeve is provided with a second end face gear ring matched with the first end face gear ring; the motion conversion sleeve is located below the driving sleeve, and the position is fixed; the motion conversion sleeve is sleeved on the push rod and is provided with a first internal thread, and the push rod is provided with a first external thread matched with the first internal thread. The present invention can better control the injection dose.

The utility model relates to the field of injection molding machines, and discloses a novel machine barrel fixing structure which comprises a machine barrel seat, a machine barrel which is horizontally inserted into the machine barrel seat and of which the outer ring wall is concavely provided with a ring groove, and a pair of connecting semi-rings which are partially inserted into the ring groove, are partially exposed out of the ring groove and are locked with the machine barrel seat through first screws, the connecting semi-ring is arranged on one side, far away from the injection direction of the machine barrel, of the machine barrel seat, and the locking direction of the first screw is the same as the injection direction of the machine barrel, so that when the first screw on the connecting semi-ring is subjected to injection force, the connecting semi-ring is arranged on one side, far away from the injection direction, of the machine barrel seat, and the locking direction of the first screw is the same as the arrangement direction of the machine barrel; therefore, when the connecting semi-ring is subjected to injection force, the machine barrel base can support the connecting semi-ring, so that the injection force borne by the first screws on the connecting semi-ring is reduced, the service life of the first screws is prolonged, and meanwhile, the number of the first screws can be reduced.

A monitoring device for monitoring a pressure or an injection force of a plurality of jets generated by channels at an outlet of a nozzle of a needleless injection device. The monitoring device includes a plurality of measuring elements. Each of the plurality of measuring elements are configured to measure the pressure or the injection force of a corresponding jet of the plurality of jets. Each of the plurality of measuring elements include a receiving face oriented to receive the corresponding jet.

The utility model discloses a sandglass-shaped firework device structure, which comprises an ignition and explosion device (4) and a firework pulling line (12), and is characterized in that the firework device structure is of a sandglass-shaped structure formed by oppositely connecting two-way conical openings of an upper conical barrel and a lower conical barrel into a whole, and the sandglass-shaped firework device structure comprises a lower conical barrel A (1) and an upper conical barrel B (6), a middle partition plate (3) is arranged in an inner cavity of the conical opening butt joint portion of the lower conical barrel A and the upper conical barrel B, a center through hole (2) is formed in the middle partition plate, and an ignition and explosion device (4) is installed above the center through hole. And the middle part of the inner cavity of the upper conical barrel B (6) is also connected with an effect body supporting partition plate (7) for assembling and placing a firework effect object combination body (8). The utility model has the advantages of unique and elegant design and modeling, strong blast injection force, optimized and simple integral structure, easiness in processing, convenience in assembly, safety and reliability in setting off and the like.

This invention discloses a material tube assembly for an injection molding machine injection system, including a locking platen, a melt cylinder, a nozzle, and a nozzle flange. The locking platen has a locking cavity, and the nozzle is fixed to the nozzle flange for injection. The front end of the melt cylinder has a flange connection portion integrally forged therewith. The outer diameter of the flange connection portion is smaller than the inner diameter of the locking cavity. The flange connection portion is connected and fastened to the nozzle flange, whose outer diameter is smaller than the inner diameter of the locking cavity, by several fasteners. The fastening force between the flange connection portion and the nozzle flange is sufficient to overcome the injection force generated when the nozzle injects material. This invention, by connecting the flange connection portion integrally formed with the melt cylinder to the nozzle flange, and ensuring that the fastening force between the flange connection portion and the nozzle flange overcomes the injection force generated when the nozzle injects material, allows the front end assembly of the melt cylinder to extend into the locking cavity without lengthening the nozzle, shortening the injection flow path and thus reducing the injection pressure loss during injection.

The invention belongs to the technical field of die-casting machine control and discloses a double-energy-accumulator die-casting machine oil way system which comprises an injection oil cylinder and energy accumulators and further comprises a pressurizing energy accumulator, the pressurizing energy accumulator comprises a pressurizing cavity and an annular cavity, the pressurizing cavity is communicated with a rodless cavity of the injection oil cylinder, and the annular cavity is communicated with an annular cavity of the injection oil cylinder. The energy accumulator is communicated with an annular cavity of the pressurizing energy accumulator through a first servo valve, the annular cavity is communicated with an oil tank through a second servo valve, and a rod cavity of the injection oil cylinder is communicated with the oil tank through a third servo valve. According to the scheme, A-bridge control is formed on the pressurizing energy accumulator through the first servo valve and the second servo valve, and different pressurizing injection forces of the injection oil cylinder are controlled by controlling the pressure of an annular cavity of the pressurizing energy accumulator; the third servo valve can regulate and control oil discharge of a rod cavity of the injection oil cylinder, so that the injection speed of the injection oil cylinder can be regulated and controlled; according to the scheme, accurate control over the injection speed and the injection force can be achieved only through three servo valves.

The utility model relates to a pushing and injecting button assembly and a pressing driving mechanism, the pushing and injecting button assembly comprises a button part and a transmission part, the button part and the transmission part rotate relatively in the pushing and injecting process, the pushing and injecting button assembly further comprises a low-friction part, and the low-friction part is used for transmitting pushing force borne by the button part to the transmission part; the dynamic friction coefficient of the button part and the transmission part is defined as a reference friction coefficient; the low-friction part rotates relative to the button part in the injection process, the dynamic friction coefficient of the low-friction part and the button part is defined as a first friction coefficient, and the first friction coefficient is configured to be smaller than a reference friction coefficient; and / or, the low-friction part rotates relative to the transmission part in the injection process, the dynamic friction coefficient of the low-friction part and the transmission part is defined as a second friction coefficient, and the second friction coefficient is configured to be smaller than the reference friction coefficient. The friction resistance of a user in the injection process is reduced, and the purpose of reducing the injection force of the user is achieved.

To provide a cast-molding apparatus effective for further improving the quality of a die-cast product.SOLUTION: A cast-molding apparatus 1 includes a mold 10, a cavity 13 formed by the mold 10, injection means 20 that is driven by a hydraulic fluid and injects a molten metal into the cavity 13, control means 100 that controls an injection speed of the injection means 20, a die line L1 indicating a correlation between the injection speed and an injection force necessary for supplying the molten metal into the cavity 13, and a machine line L2 indicating a correlation between the injection speed and an injection force that can be generated by the injection means 20. The control means 100 is configured to generate a margin die line L1 obtained by shifting the die line L11 by a predetermined correction amount in a direction of increasing the injection output, specify an injection speed corresponding to an intersection between the margin die line L11 and the machine line L2 as a target injection speed, and accelerate the injection speed to the target injection speed and maintain the injection speed in the vicinity of the target injection speed.SELECTED DRAWING: Figure 3

The invention relates to a drive device, to an injection device (2) having a drive device (21, 23, 26, 26a, 27) and to an injection molding machine having such a drive device (21, 23, 26, 26a, 27), the drive device (21, 23, 26, 26a, 27) applying the injection force required for injection by means of a mixing unit which combines a hydraulic drive (21, 23) and an electric drive (26, 26a, 27) in mechanical series.

The invention discloses a sleeve for local anesthetic injection and an injection assembly, and relates to the technical field of injectors, the sleeve comprises a needle cylinder and a push rod which moves in the needle cylinder in the axial direction to boost liquid medicine, a piston is fixedly arranged at the end of the push rod, the sleeve comprises a needle seat which is arranged at the first end of the needle cylinder and used for supplying liquid to a needle head, and a liquid medicine tube is arranged on the needle seat; the adjusting sleeve is movably arranged in the axial direction and is driven by the spring to be kept in the initial state of enabling the liquid medicine tube to be unblocked. According to the sleeve for local anesthetic injection and the injection assembly, when the injection pressure is too large, the adjusting sleeve moves in the axial direction and is not in the initial state, so that the liquid medicine tube is blocked, liquid feeding is stopped, friction resistance generated by the expansion bag to the piston counteracts part of thrust F, the speed of the piston is low, the injection force is further reduced, and meanwhile the injection effect is improved. And through the arrangement of the pressure release valve, the liquid can automatically overflow into the liquid overflow cavity when the hydraulic pressure is too large, and the discomfort in the injection process can be reduced through the mode of reducing the hydraulic pressure.

The utility model relates to a primary-secondary type injection oil cylinder for an extrusion casting machine. The primary-secondary type injection oil cylinder comprises an injection oil cylinder and a quick oil cylinder, the injection oil cylinder and the rapid oil cylinder are located outside the rapid oil cylinder and have the same telescopic direction. The injection oil cylinder comprises an injection oil cylinder barrel, an injection oil cylinder piston, an injection oil cylinder piston rod, an injection oil cylinder flange, an injection oil cylinder rear cylinder cover and an injection oil cylinder front cylinder cover; the rapid oil cylinder comprises a rapid oil cylinder plunger and a rapid oil cylinder cover. The front end of the rapid oil cylinder plunger is inserted into a central blind hole of the injection oil cylinder piston rod, and the rear end of the rapid oil cylinder plunger is fixedly connected with a rear cylinder cover of the injection oil cylinder through a flange. And the injection oil cylinder piston can move back and forth in an inner hole of the injection oil cylinder barrel. According to the pressure injection oil cylinder, the speed of a traditional pressure injection oil cylinder can be achieved without an energy accumulator, and meanwhile pressure injection force is kept stable during pressurizing pressure injection. The squeeze casting machine is high in structural strength, energy storage time is not needed, meanwhile, the displacement of the oil pump is small, and energy consumption is low.

The utility model discloses automatic bubble removing equipment for an in-mold injection molding surface. The automatic bubble removing equipment comprises a main body assembly, wherein the main body assembly comprises a lower mold and an upper mold; the auxiliary assembly comprises an injection molding cylinder, a pull handle, a fixing frame, a rotating gear, a connecting rod, a clamping block and a connecting plate; the injection molding barrel is fixedly connected to the center of the top end of the upper mold, the fixing frame is fixedly connected to the two sides of the outer wall of the injection molding barrel, the pull handle is slidably connected to one side of the outer wall of the injection molding barrel, and the rotating gear is rotatably connected to one side of the outer wall of the fixing frame. The upper die is installed at the top end of the lower die, and exhaust holes are formed in the outer surface of the upper die. The utility model discloses an automatic bubble removing device, and aims to solve the problem that injection molding liquid is easy to splash out through a joint between an injection molding opening and an insertion pipe when the injection molding force is too large due to no clamping of an auxiliary structure in the process of carrying out injection molding on the interior of a mold by existing automatic bubble removing equipment, so that the injection molding effect is influenced.

A drive device includes an output for an injection piston of an injection device to be acted upon to generate an injection force, a hydraulic drive mechanically connected to the output for the injection piston, and an electric drive. The electric drive is mechanically connected to the output for the injection piston via the hydraulic drive, so that the drive force generated by the electric drive can be transmitted together with the drive force generated by the hydraulic drive via the hydraulic drive to the output for actuating the injection piston. The electric drive is at least partially integrated into the hydraulic drive, and has an electric motor and a coupling device. The coupling device of the electric drive is arranged completely in a cylinder of the hydraulic drive.

The present invention relates to a mold (1) for manufacturing a one-piece bicycle, tricycle, quadricycle, or motorcycle frame (32) by injecting a polymer material, the mold (1) comprising a fixed part (2) and a movable part (3) capable of moving towards or away from the fixed part to close or open the mold respectively, which together delimit a molding cavity (8) of the frame when the mold is closed, the mold (1) being characterized in that: - it comprises at least three sliders (15, 16, 17, 18), capable of being inserted into respective cavities (11, 12, 13, 14) of the molding cavity (8) whose positioning within said molding cavity and profile correspond to parts of the frame to be manufactured, said sliders (15, 16, 17, 18) being intended to be overmolded with polymer material during a molding operation so as to form said parts of the frame (32), - at least two of these sliders (15, 16, 17,18) are engaged with each other when in position in their respective imprint, thus forming a solid structure capable of resisting injection forces. Figure for abstract: Fig. 1,

This utility model relates to the field of medical device manufacturing technology, and in particular to an injection force activation mechanism and an emergency injection pen including the same. The injection force activation mechanism includes a columnar spring, an activation rod, a spring housing, and an inner body arranged sequentially from the inside out. The activation rod is formed with a receiving cavity and a radially extending limiting structure. The inner body is formed with a radially rebound blocking structure. The columnar spring is housed by the spring housing and axially compressed, and is vertically inserted into the receiving cavity. In the initial state, under the synergistic action of the radially extending limiting structure and the radially rebound blocking structure, the axial displacement freedom of the activation rod is restricted, and the columnar spring remains in a compressed state; when the emergency injection pen is activated, and after the radially rebound blocking structure and the radially extending limiting structure lose their blocking constraint relationship, the elastic potential energy stored in the columnar spring is released, and the activation rod can push the PFS component.

The utility model relates to the technical field of die-casting automatic demolding and spraying, in particular to a gas-liquid proportion adjustable spray head which comprises a mounting seat, an extrusion mechanism, an adjusting part, a connecting pipe, a sliding assembly, a connecting arm, a locking rod and a nozzle, the nozzle is provided with a locking hole, the extrusion mechanism is slidably connected with the mounting seat, one end of the adjusting part is slidably connected with the mounting seat, and the other end of the adjusting part is slidably connected with the sliding assembly. The other end of the adjusting component is fixedly connected with the extrusion mechanism, the lock hole is formed in the nozzle, the connecting pipe is fixedly connected with the mounting base, the sliding assembly, the connecting arm and the lock rod are arranged on the connecting pipe, the connecting arm is in sliding connection with the sliding assembly, the lock rod is fixedly connected with the sliding assembly, and the nozzle is arranged on the connecting pipe. The problems that when an existing spray head is used for spraying demolding, the spraying force and the spraying flow cannot be adjusted, and practicability is affected are solved.

The utility model relates to the field of pressure sensors, and discloses an assembly tool for a pressure sensor, which comprises a base, a rotating disc and an adsorption grabbing disc, two groups of symmetrically distributed movable screw rods are rotatably mounted between two fixed plates through bearings, a movable plate is mounted on the two movable screw rods in a left-right moving manner, and the adsorption grabbing disc is mounted on the movable plate. The lifting air cylinders are installed on the left side and the right side of the upper portion of the movable plate correspondingly, push rods of the lifting air cylinders penetrate through the movable plate to be arranged below the movable plate, the adsorption grabbing disc is fixed to the bottom ends of the push rods of the lifting air cylinders, and the rotating disc is rotationally arranged on the surface of the upper end of the base and connected with an output shaft of the rotating motor through a shaft rod. The two symmetrical lifting air cylinders are arranged above the movable plate, the two adsorption grabbing discs are arranged below the two lifting air cylinders correspondingly, when one lifting air cylinder is used for assembling the wax injection force sensor, the other lifting air cylinder can grab accessories to make preparations for next-time assembling, and the assembling efficiency is improved.

An injection unit for a molding machine (2), comprising: a cartridge (3); an injection actuator (4), which is designed to push the plasticized molding compound out of the cartridge (3) via the injection nozzle (5); at least one sensor which is designed to detect a time-resolved signal characterizing the driving force of the injection actuator (4); and an open-loop or closed-loop control device (6) for open-loop or closed-loop control of the injection actuator (4), which is designed to receive a time-resolved characteristic signal of the at least one sensor, wherein the open-loop or closed-loop control device (6) is designed to carry out the following steps: actuating the injection actuator (4) in order to carry out a movement towards the injection nozzle (5); detecting a time-resolved signal characterizing the driving force of the injection actuator (4); determining a substantially constant force level over a period of time, preferably before a significant increase in the injection force level occurs; and calculating the pressure loss ([delta] p), preferably on the basis of the first force level.

The application relates to a continuous inlay mold inner injection mold and process. Belonging to the technical field of loudspeaker accessory injection molds, the mold comprises an upper mold group, a lower mold group, a jacking mechanism and a pull winding mechanism. The injection area and the belt positioning area of the lower mold group are provided with mounting grooves, and a jacking column is arranged in the grooves. The jacking mechanism drives the vertical lifting of a material passing block through the cooperation of a driving body and a slope mechanism, so that the jacking column of the lower mold group is accurately jacked into or away from the first and second positioning holes on the material belt. The process flow comprises the steps of material belt passing, jacking column positioning injection, separation and automatic stepping. Through the precise mechanical interlocking of the jacking column and the positioning hole, the problem of high defective rate caused by the easy deviation and overturning of the extremely small size inlay under the injection force is effectively solved, and the positioning precision and the production automation degree are remarkably improved.

The utility model discloses a low-friction injector medicine pushing mechanism which comprises a driving nut, a push rod, a guide sleeve and an annular support, the driving nut is rotationally arranged in the annular support, threads are arranged on the outer circumferential face of the push rod, the push rod is in threaded connection with the driving nut, and the guide sleeve is fixedly arranged in the annular support. The push rod is slidably connected with a center hole of the guide sleeve, the diameter of the push rod is smaller than that of the center hole of the guide sleeve, the guide sleeve and the driving nut are coaxially arranged, and the driving nut is in power connection with the power assembly. According to the low-friction injector medicine pushing mechanism, the driving nut rotates to drive the screw to move along the axis, the piston core rod of the injector is pushed for injection, the push rod only moves in the axial direction, relative rotation does not exist between the push rod and the piston core rod of the injector, friction force during injection is reduced, the movable assembly is used for pushing injection, and the injection efficiency is improved. The injection speed and the injection force are kept consistent, and the experience feeling of a patient is improved.

The invention discloses an injection system of a die-casting machine, which belongs to the technical field of die-casting machine control and comprises an oil cylinder assembly formed by an injection oil cylinder and a pressurizing oil cylinder which are connected in series. The hydraulic system further comprises an energy accumulator, a first servo valve is arranged between the energy accumulator and an inlet of the oil cylinder assembly, and a second servo valve is arranged at the outlet end of the oil cylinder assembly. During rapid control, oil in a rod cavity of the injection oil cylinder flows back to the oil tank through the opening degree adjustment of the second servo valve; during pressurization control, oil in the energy accumulator enters rod cavities of the injection oil cylinder and the pressurization oil cylinder through the first servo valve and is discharged through the second servo valve, and the pressure is controlled through the opening degree proportion of the first servo valve and the second servo valve. According to the scheme, the two servo valves are used for controlling the die-casting machine to have the effects of being high in speed adjustment speed in the rapid stage, short in pressure building time in the pressurization stage and accurate in injection force control.

The invention discloses a cell dispersion instrument, and relates to the technical field of biological experiments. Comprising an instrument body, and an injector moving mechanism and a test tube moving mechanism are arranged in the instrument body; the injector moving mechanism is positioned above the test tube moving mechanism; the injector moving mechanism comprises a first mounting plate, and the first mounting plate is fixedly connected to the inner walls of the two sides of the instrument body and is obliquely arranged. By means of the injector moving mechanism, the aim of automatically and accurately controlling movement and injection of the injector can be achieved, the injector moving mechanism comprises a first motor, a second motor, a lead screw driven by the first motor, a sliding rail, a sliding block and other assemblies, and vertical movement of the injector and drawing action of a piston can be accurately controlled; therefore, automatic liquid suction and liquid injection of the cell reagent are realized, and the suction and injection force and speed can be customized, so that boring and repeated labor of manual operation is avoided, the operation is standardized and repeatable, and the experiment efficiency and accuracy are improved.

The invention relates to a firing device for a needleless injector and a needleless injection system. The needleless injector includes an injection chamber housing and a piston assembly. The launching equipment comprises a power push rod, a power assembly and a launching assembly. The power push rod is configured to be connectable to the piston assembly. The power assembly comprises a power storage unit and a power output part, the power storage unit is constructed to be capable of storing or generating power used for driving the power output part to move, and the power output part is connected to the power push rod to drive the power push rod to move. The launching assembly comprises a launching rod and a control device, the launching rod is connected to the power push rod and can move synchronously with the power push rod, and the control device is configured to control the launching time of the launching rod in the state that the power output piece is driven by power. According to the scheme, the controllable power assembly is combined with the launching assembly, so that the injection force and the injection time are more controllable.

The utility model relates to the technical field of pistons for injectors, and aims to solve the problems that pistons are low in sealing performance, force application is inconvenient, and injection force and injection amount cannot be accurately controlled. The utility model provides a piston for a pre-filled syringe. The piston comprises a piston body, the plug body comprises a first end part and a second end part; the first end part is provided with a conical sealing head; a sealing boss is annularly arranged on the outer side wall of the second end part; a plurality of convex rings are arranged between the conical sealing head and the sealing boss at intervals; the convex rings are arranged on the outer wall of the plug body; according to the piston for the pre-filled syringe, the sealing performance and the accuracy in the injection process are guaranteed, and the accumulation and waste of injection liquid and the resistance in the later stage of propelling injection are reduced.

A fluid injector for injecting discrete volumes of propellant. The fluid injector includes a body and at least one nozzle defined between first and second surfaces of the body. The fluid injector further comprises: a barrier fluid supply for supplying a barrier fluid to each of one or more of the at least one nozzle; a propellant supply for supplying a propellant to each of the one or more nozzles; and an injector for applying an injection force to the injection agent contained in each of the one or more nozzles. In use, the fluid injector performs a barrier fluid supply step in which a barrier fluid supply supplies barrier fluid to each of the one or more nozzles, and then performs a propellant supply step in which a propellant supply supplies propellant to each of the one or more nozzles; and then performing an injection step in which an injector applies an injection force to the propellant contained within each of the one or more nozzles to cause at least some of the propellant to be injected from each of the one or more nozzles. A barrier fluid at least partially coats an interior surface of each of the one or more nozzles to reduce contact of propellant with the interior surface of each of the one or more nozzles.