31results about How to "Improve injection molding efficiency" patented technology

The utility model discloses a slide block glue feeding structure of a plastic mould, which comprises a diving gate assembly and a slide block of the mould, the diving gate assembly comprises a diving port and a runner, the runner is arranged in an upper mould of the mould, the diving port is arranged in the slide block, and when the mould is closed and the slide block enters a core, the runner is arranged in the slide block. The diving opening is communicated with a cavity of the injection mold, a connecting section is arranged between the diving opening and the runner, the end, away from the cavity, of the diving opening is communicated with the end, located in the mold, of the runner through the connecting section, and the connecting section is vertically arranged; the diving opening is obliquely arranged relative to the horizontal plane, and the included angle between the diving opening and the connecting section is an obtuse angle. According to the utility model, the arrangement of cold runners is reduced, the length of the whole runner is shortened, and the forming period is shortened, so that the efficiency is improved.

The application discloses a kind of injection molding equipment of plastic shell, including processing table, injection device, first mould, second mould, support plate, multiple embedded components, multiple push components and ejection assembly, first mould and second mould are oppositely arranged above the processing table, and membrane cavity is equipped between first mould and second mould;Injection device is arranged on the sliding table of first sliding table module, the inner wall of second mould is equipped with multiple positioning columns, the sliding table of second sliding table module is equipped with connecting plate, multiple embedded components are arranged on the connecting plate, and multiple embedded components are connected by first transmission component between multiple embedded components, the upper surface of processing table is equipped with box, push component is arranged inside the box, and multiple push components are connected by second transmission component between multiple push components, ejection assembly is arranged outside second mould.

This utility model provides an in-mold hot-cutting device for injection molding machines, including a fixed mounting plate and an injection mounting plate. The fixed mounting plate is connected to a mold parting assembly and has a push groove. The mold parting assembly is connected to a mold component, which includes a mold assembly and an injection assembly. The injection assembly includes an injection mounting plate, which is rotatably connected to an injection mold plate. A hot-cutting lever is inserted into the side of the injection mounting plate. By causing the injection mounting plate and the injection mold plate to rotate relative to each other, the injection gate is cut off, realizing in-mold hot-cutting technology. This separates the injection-molded model from the injection runner. The central mold parting rod can push out the injection runner, and the mold parting push rod can push out the injection-molded product. This reduces the steps required to separate the runner after injection molding, simplifies the workflow, improves injection efficiency, does not affect the product appearance quality, and significantly reduces the product scrap rate.

The utility model discloses a mold structure for a small water gap eccentric thin wall in a climbing injection molding process, which comprises a base, and a lower mold seat is fixedly arranged in the middle of the top end of the base. Smooth flowing of plastics can be ensured, uneven flowing can be reduced, defects caused by uneven flowing in the injection molding process are avoided, the climbing part is arranged in the flow guide channel, smooth flowing of plastic materials in the mold can be ensured, the problems of uneven cooling and bubbles caused by flow speed changes are avoided, and the injection molding quality is improved. The multiple eccentric small water openings are formed, multi-section injection can be conducted at the same time, then the injection molding efficiency is improved, an air cooler is powered on to generate cold air, the cold air is guided into a first annular cooling groove and a second cooling groove through an air outlet pipe, then materials in a forming groove can be evenly cooled, and therefore the cooling time is shortened, and the injection molding efficiency is improved. The working efficiency is improved.

The utility model relates to the technical field of injection molding machines, and provides an injection molding machine for efficient injection molding of a top cover plate of a washing machine, which comprises a bottom plate and a U-shaped plate I fixedly connected to the top of the bottom plate. The controller controls the second electric telescopic rod to start and stretch, the first movable plate and the hollow ejector rod are pushed to move upwards, the top cover plate of the washing machine is loosened to a certain degree, then the controller controls the air pump to start, the air pump conveys air into the annular pipe, the air passes through the telescopic hose, the hollow ejector rod and the air hole in sequence, and the air is conveyed into the annular pipe. The top cover plate of the washing machine is loosened from the lower mold under the cooperation of the air pressure, so that the condition that the top cover plate of the washing machine is tightly attached to the lower mold and is difficult to demold can be avoided, the demolding time is shortened, and the demolding efficiency is improved. Therefore, the injection molding efficiency of the washing machine top cover plate is improved.

This utility model provides an eccentricity detection device and an injection mold for an air conditioning transmission assembly formed therefrom. The eccentricity detection device includes: a first detection component comprising M first sensors, which are spaced apart along the length of the rod; the M first sensors are located on a first detection line; a second detection component comprising N second sensors, which are spaced apart along the length of the rod; the N second sensors are located on a second detection line; the first and second detection lines do not coincide; M and N are both integers greater than 0; and a signal output component connected to both the first and second sensors. This application can determine whether the rod has experienced axial deviation by measuring the distance between the rod and the first or second sensor; the sensors of this application have a small footprint, are simple to operate, and can improve the efficiency and accuracy of rod axiality detection.

This invention belongs to the field of mold manufacturing technology, specifically an over-injection correction system and method for injection molds. The system includes a lower base plate and an upper base plate of the injection mold. A support pad is symmetrically fixed to one side of the lower base plate, and a temperature control base is fixed to one side of the support pad. A lower mold plate is mounted on the middle surface of the temperature control base, and a correction mechanism is installed inside the temperature control base. An injection mechanism is mounted on the outer surface of the lower mold plate. A material conveying cylinder is mounted on one side of the upper base plate, and a uniform feeding mechanism is installed inside the material conveying cylinder. This over-injection correction system and method for injection molds works by exposing the discharge port of the discharge pipe at the upper end of one side of the correction groove during the downward movement of the lower mold plate due to over-injection. Excess material is then discharged through the inclined discharge pipe to the connecting pipe on the outside. Furthermore, a pressure relief valve releases pressure inside the injection cavity, thus meeting the injection requirements.

The utility model discloses a fixed nut's automatic shedding mould relates to nut injection molding field, include: back template, injection demoulding mechanism, this mechanism sets up in back template top. The utility model discloses a injection demoulding mechanism's effect can injection molding fixed nut, and can the nut of injection molding that finishes is handled fast demolding, in the process of pushing front template to back template, front template drives lower pressing plate to remove, and lower pressing plate drives two inclined guide pillars to remove, and makes two side templates move on the track oppositely, after sticking side template, extruding plate is pressed in the outside, and adaptive pressure plate is pressed in the top, and through the injection port on front template adds raw materials, after nut forming, the front template moves from back template injection cavity board one side outward, under the action of first spring, applies reverse thrust to injection cavity board, and the nut that injection molding that finishes is demoulded, has the effect that the nut that injection molding that finishes is handled fast demolding, improves the injection efficiency of fixed nut.

The utility model discloses a kind of injection mould of quick cooling forming, comprising: the base of ejection mechanism is installed in inside;Lower mould, lower mould is placed in the top of the base, the middle part of the lower mould is fixedly connected with mould core, the bottom of the mould core is equipped with multiple circulating water holes;Upper mould, upper mould is placed in the top of the lower mould, the bottom of the upper mould is provided with the cavity of cooperation with mould core;The beneficial effects of the utility model are: through the circulating water hole of mould core bottom and the water delivery hole on cold water plate, a spiral water cooling system of water diversion is formed;Water is introduced into the circulating water hole in the bottom of mould core by cold water pin, so that cooling water can be directly contacted with mould core, efficient heat exchange is realized, so that mould core temperature is quickly reduced, and injection molding efficiency is improved.

This utility model discloses a nylon-reinforced cement nail mold and cement nail, relating to the field of injection molding technology. The mold includes a lower mold and an upper mold: the lower mold has nail tip positioning holes to fix the nail tip, and the upper mold has a nail head positioning groove on the top. After the mold is closed, an annular cavity and a recessed cavity are formed. Nylon material is synchronously filled through an integrated flow channel, forming a mechanical interlocking structure. The four corner guide pillars and guide sleeves of the mold adopt a conical fit for self-alignment. The ejection mechanism of the lower mold pushes the nail tip through a conical ejector pin. The bottom of the annular cavity and the side wall of the recessed cavity are provided with multi-stage injection channels, with micropores distributed radially and spirally to uniformly fill the material. The pressure plate of the upper mold presses the nail head through hinges and elastic fasteners. The product produced using this utility model has both high strength and impact toughness, effectively improving fastening and seismic performance, solving the problems of easy falling off and insufficient strength of traditional cement nails. It is suitable for the field of building decoration and has the advantages of compact structure and stable performance.

The application provides a rotary feeding mechanism, which comprises a bottom plate, a machine arm and a hydraulic cylinder, the machine arm is fixed on one side of the upper surface of the bottom plate, the hydraulic cylinder is fixed on the upper end of the machine arm, further comprises a supporting rotating rod, a rotating disc, a lower mold, an upper mold, an extension slot, an ejection rod, a rotary feeding mechanism, an ejection mechanism and a discharging mechanism, the supporting rotating rod is rotationally connected to the middle part of the upper surface of the bottom plate away from the machine arm through a bearing, the rotating disc is fixed on the top of the supporting rotating rod, four lower molds are equidistantly embedded and fixed on the surface of the rotating disc, four mold cavities are arranged on the surface of the lower mold, and the upper mold is fixed on the extension end of the hydraulic cylinder; the application does not need to sequentially carry out feeding and discharging work after completing injection molding, thereby greatly improving the injection molding efficiency of the chip, thereby greatly improving the production efficiency, and facilitating the use of enterprises.

The utility model relates to the technical field of injection molding process especially is used to a front mould oblique position structure for injection mould, including the front mould fixed plate, the water gap board, the backing plate, the front mould frame and the front mould kernel that set up in proper order, still include the front mould insert piece and the row position guide pillar, the front mould insert piece is worn and is set in the front mould kernel, and under the guidance of the mould kernel inclined plane of front mould kernel, oblique inserts injection molding cavity, thereby injection molding forms the oblique recess of plastic part, the one end of row position guide pillar is fixedly connected in the water gap board, its other end passes through the backing plate and the front mould frame, and with the front mould insert piece forms the lock joint of movable, makes row position guide pillar drive front mould insert piece and exits from the oblique recess. Above all, the utility model through the lock joint and water gap board linkage drive of ingenuity, has simplified the mould structure significantly, has improved injection molding efficiency, has guaranteed the plastic part forming quality. Its modular design and high performance price ratio make it easy to manufacture, maintain and market promotion.

The injection molding device comprises a fixed injection molding mold, a movable injection molding mold is connected to the top end of the fixed injection molding mold in a clamped mode, an injection molding nozzle is fixedly embedded in the upper surface of the movable injection molding mold, and two electric push rods are fixedly connected to the upper surface of the movable injection molding mold; a containing groove is formed in the bottom face of the fixed injection mold, and the inner top wall of the containing groove is fixedly connected with a circulating cooling pipe. According to the device, through the arrangement of the injection molding fixed mold, the supporting plate, the electric telescopic rod, the jacking rod and the jacking plate, the electric telescopic rod can work to drive the jacking plate to move up and down, jacking demolding of an injection molding waterproof plate is achieved, and through the arrangement of the circulating cooling pipe, the connector and the control water valve, external circulating cooling water can be connected; water cooling of the injection molding fixed mold is achieved, the adhesion phenomenon of the waterproof plate is reduced, demolding of the injection molding waterproof plate is assisted, rapid demolding operation of the injection molding waterproof plate is facilitated, and the injection molding efficiency of the waterproof plate is effectively improved.

This application belongs to the field of injection molds, specifically disclosing an injection mold structure and injection method. It includes a first mold and a second mold adapted to each other, with a molding cavity between the first and second molds. A mold-changing cavity is formed on the first mold, and a guide groove is provided between the mold-changing cavity and the molding cavity, connecting them. The direction of the guide groove is perpendicular to the direction of the mold-changing cavity and the molding cavity. A plurality of molding inserts are arranged along the direction of the guide groove within the mold-changing cavity. The injection mold structure also includes a first driving assembly and a second driving assembly disposed on the first mold. The output end of the first driving assembly is located in the mold-changing cavity. The first driving assembly drives a molding insert through the guide groove into the molding cavity and back into the mold-changing cavity. The second driving assembly drives the molding insert to move within the mold-changing cavity. This application has the effect of improving injection efficiency by increasing the efficiency of molding insert replacement and shortening the injection cycle.

The utility model discloses a continuous feeding injection molding device, which belongs to the technical field of wire injection molding and comprises a base plate and a double-station continuous clamping and moving mechanism. A double-station continuous clamping and transferring mechanism is mounted on the rear side of the upper end of the base plate; the double-station continuous clamping and material moving mechanism comprises a double-rotor linear module, a synchronous moving and clamping assembly and a moving assembly. An injection molding machine body is fixedly mounted in the middle of the front side of the substrate; an upper mold is fixedly mounted at the movable end of the injection molding machine body; an injection molding hole is formed in the upper mold; the lower die is fixedly installed on the front side of the base plate. By means of the mode, continuous injection molding operation on the wire can be achieved, automatic feeding and discharging of the wire are achieved, the extra workload of manual feeding and discharging is reduced, accurate alignment inserting connection of a data line port and an embedding mold is guaranteed through the wire port inserting and inserting mechanism, and the production efficiency is improved. And skewing of data line port pins caused by deviation during manual plugging is avoided.

The utility model relates to an efficient energy-saving plastic bottle blank injection molding machine, which comprises a shell covered on the periphery, a feeding mechanism and an injection molding cavity are arranged in the shell, a mold closing mechanism is arranged in the opposite direction of the injection molding cavity and is used for injection molding of a plastic bottle blank, the feeding mechanism comprises a first motor arranged at the head end of the shell, and a power output end of the first motor is sleeved with a first belt wheel; the first belt wheel is connected with an adapter pipe, a plurality of heating rings are sleeved on the adapter pipe to heat bottle blank raw materials, a rotatable feeding paddle is screwed in the adapter pipe, and the tail end of the feeding paddle is connected with an injection molding cavity; the mold closing mechanism comprises a second motor arranged at the rear end of the shell, the second motor is connected with a lead screw, a mold closing plate arranged opposite to the injection molding cavity is arranged at the tail end of the lead screw, and mold closing-demolding is achieved along with driving of the lead screw to advance and retreat; the production efficiency is improved and the energy consumption is reduced through the optimal design of links such as feeding, heating and mold closing.

The utility model discloses a vertical injection molding machine charging barrel saliva leakage prevention non-return nozzle structure, which relates to the technical field of injection molding machines, and comprises a base, the top of the base is fixedly connected with an operation table, one side of the top of the operation table is fixedly connected with the injection molding machine, one side of the injection molding machine is provided with a nozzle, a non-return assembly is arranged in the nozzle, and the injection molding machine is fixedly connected with the injection molding machine. And a non-return assembly is arranged on the other side of the top of the operation table, an injection molding assembly is arranged on the other side of the top of the operation table, the non-return assembly and the injection molding assembly are used in cooperation, the non-return assembly comprises a sliding column, and an adjusting block is slidably connected into an adjusting groove and fixedly connected with the sliding column. According to the saliva leakage prevention non-return nozzle structure for the charging barrel of the vertical injection molding machine disclosed by the utility model, the sealing ball clings to the sealing ring under the action of the sealing spring through the arranged non-return assembly, and the sealing ball seals and blocks the injection molding opening, so that melt backflow is prevented, the situations of injection pressure loss and inaccurate metering are avoided, the structure is simple, and the practicability is relatively high.

The application provides an injection mold blanking device for automobile injection molding parts, and belongs to the technical field of injection molds. The injection mold blanking device for automobile injection molding parts comprises a driving assembly and a pushing assembly. The driving assembly comprises a base, a lower mold, an upper mold, a hydraulic rod, a rack plate, a gear, a transmission rod and a ejector rod. The pushing assembly comprises a cylinder and an adjustable push block. The base, the lower mold, the upper mold, the hydraulic rod, the rack plate, the gear, the transmission rod and the ejector rod are arranged. When the hydraulic rod drives the upper mold to move, the transmission rod drives the gear to rotate, the gear drives the rack plate to move, and the rack plate drives the lower mold to move, so that the lower mold and the upper mold move close to each other, thereby improving the injection efficiency. The cylinder and the adjustable push block can be separated from the lower mold and the upper mold, the ejector rod can eject the product, the cylinder and the adjustable push block can timely push the product to be blanked, the blanking efficiency is greatly improved, and the separation distance of the lower mold and the upper mold is not too large.

The utility model discloses an air conditioner assembly injection mold replacing device which comprises a base and a mold positioning plate, a mold positioning groove is formed in the mold positioning plate, an L-shaped fixing support is installed on the base, a linear sliding table is installed at the cross arm end of the L-shaped fixing support, a hydraulic cylinder is installed at the bottom of a moving block of the linear sliding table, and the hydraulic cylinder is connected with the L-shaped fixing support. A lifting plate is installed on a piston rod of the hydraulic cylinder, a multi-stage hydraulic cylinder is installed at the bottom of the lifting plate, a fixing plate is installed at the telescopic end of the multi-stage hydraulic cylinder, a plurality of cavity dividing suction cups are installed on the fixing plate, fixing side plates are installed on the two sides of the bottom of the lifting plate, and clamping air cylinders are installed on the fixing side plates. A clamping plate is installed at the telescopic end of the clamping air cylinder. The injection mold has the beneficial effects that the clamping and fixing effects are improved, the mold is prevented from falling off, the injection mold is convenient to replace, the operation is simple, the use is convenient, the mold replacement efficiency is improved, and the injection molding working efficiency is improved.

The utility model discloses a candle production mould, which relates to the technical field of candle production, and comprises a mould, the outer wall of the mould is provided with a fixed clamping mechanism, the top of the mould is provided with a plurality of vertically through mould holes, the side edge of the fixed clamping mechanism is provided with a sliding mechanism, the bottom of the mould is movably connected with a base, and the bottom of the base is provided with a fixed clamping mechanism. Electric hydraulic rods are fixedly connected to the left side and the right side of the top of the base correspondingly, and a wire fixing mechanism is arranged at the bottom of the base. An electric hydraulic rod is started to lift a mold, an extrusion conical column is moved to the bottom of the inner wall of a mold hole, at the moment, a supporting plate and a spring are fixed through a buckle, a first movable clamping plate and a second movable clamping plate are made to extrude towards the inner side through sliding of a movable plate, and a candle rope is fixed through staggered extrusion between two clamping grooves; by means of the mold, a lead in the middle can be rapidly fixed to the center of the mold hole after a formed candle is taken out, and therefore the injection molding efficiency of the device is improved.

The utility model relates to the technical field of injection molding, and particularly discloses a feeding device for an injection mold, which comprises four supporting columns, a working box is fixedly arranged at the tops of the four supporting columns, a crushing component is arranged in an inner cavity of the working box, a filter screen is arranged in the inner cavity of the working box and is positioned below the crushing component, and the crushing component is arranged in the inner cavity of the working box. Two fixing assemblies used in cooperation with the filter screens are arranged on one side of the working box, each fixing assembly comprises a movable box, one side of each movable box is fixedly connected with one side of the working box, a pull rod is movably arranged in an inner cavity of each movable box, and one end of each pull rod penetrates and extends to the outer portion of the corresponding movable box and is fixedly connected with a plastic clamping block. When the filter screen is disassembled, a worker pulls a plastic clamping block to clamp the plastic clamping block with a limiting block, the plastic clamping block moves to drive a pull rod to move, the pull rod moves to drive a movable block to move, a sliding block and a sliding groove are matched with the movable block to move, and the movable block moves to drive a clamping rod to move.

The utility model relates to a kind of double-mold automatic high-efficiency rubber injection molding machine, including rubber injection molding host structure, oil pressure control structure, processing operation platform structure, a group of automatic feeding structure, a group of material preparation table body, the processing operation platform structure includes the outside side table being arranged in the middle part of rubber injection molding host structure, the inner transmission path body being arranged in outside side table, the drive transmission belt being arranged in inner transmission path body. By setting double-mold automatic high-efficiency mold opening feeding structure, realize the capacity of one oil control system control multiple injection molding unit in the same time is greater than single rubber injection molding machine, and the vulcanization waiting time of injection molding unit is also fully utilized, eliminate or reduce invalid working time, production efficiency is higher, and two injection molding units share some devices again, and energy consumption is lower than two independent rubber injection molding machines.

The invention relates to the technical field of automobile production molds, in particular to an injection mold for an automobile upper framework, which comprises a lower fixing plate, a side loose core, a movable mold, an upper fixing plate, a fixing ring, a pouring pipe, a fixed mold, a temperature control assembly, a pressing type inductive switch, a mold frame, a replaceable core, a pressing pipe and an inner runner. When the recycled plastic waste is used for producing the non-bearing light-weight auxiliary framework, the temperature of the fixed mold is correspondingly compensated during injection molding, so that the adverse effect caused by melt flow rate fluctuation further caused by the temperature change of the plastic waste is made up, and the heat exchange liquid with the corresponding temperature can be correspondingly controlled after injection molding is finished; the problems that when recycled plastic waste is adopted for non-bearing lightweight auxiliary framework production, when the plastic waste enters an injection mold to flow, the plastic waste exchanges heat with a fixed mold, temperature changes are caused, MFI fluctuation is large, the yield is low, and the production cost cannot be effectively reduced are solved.

Some embodiments of the present application provide an injection mold, comprising: an outer slider reciprocating along a first horizontal direction, a through hole inclined to the first horizontal direction being formed on the outer slider; an inner slider slidingly arranged on the outer slider and having a limiting position; a slanted ejector pin penetrating the through hole and rotatably connected to the inner slider at one end to swing relative to the inner slider in a second horizontal direction to have a molding position and a demolding position, the other end of the slanted ejector pin cooperating with the outer slider to form a molding cavity capable of molding a reverse locking structure when being at the molding position, the second horizontal direction being perpendicular to the first horizontal direction; and a driving assembly comprising a driving member and a limiting member, the driving member being configured to drive the outer slider to move, and the limiting member being configured to limit the inner slider at the limiting position when the outer slider drives the slanted ejector pin to swing between the molding position and the demolding position. The outer slider drives the slanted ejector pin to swing to realize demolding, without the need to set a slanted guide pillar to drive the slanted ejector pin, which is conducive to the miniaturization design of the mold and reduces the cost.

This invention discloses an automated feeding device in the field of injection molding machine feeding technology, including a worktable, a material cylinder disposed at the center of the top of the worktable, a lid disposed at the top of the material cylinder, a pressure blower disposed at the center of the top of the lid, a discharge pipe disposed at the bottom of the pressure blower, a partition metal plate disposed on the discharge pipe, a feed hole disposed on the outer wall of the discharge pipe, a solenoid valve disposed around the feed hole, and an embedded suction pump disposed at the bottom of the discharge pipe. In this invention, by setting a discharge pipe in a traditional injection molding machine feeding device and installing an embedded suction pump within the discharge pipe, the molten material in the material cylinder can be efficiently sucked out and transported, avoiding blockage in the pipe, ensuring the normal and continuous operation of the equipment, and improving processing efficiency.

This utility model relates to the field of injection molding machine technology, specifically a screw heating device and an injection molding machine. The mechanism includes a protective box, a mounting base, a rotating base, and a feeding rod. One end of the protective box has an installation port. The mounting base is detachably installed inside the protective box, and a heating element is detachably installed inside the mounting base. The rotating base is sleeved on the outside of the mounting base and is driven to rotate by a driving component installed at the bottom of the protective box. The feeding rod has an installation cavity inside, and the end of the heating element furthest from the mounting base is inserted into the installation cavity. Spiral feeding blades are installed on the outer circumference of the feeding rod, and the feeding rod is located inside the injection molding machine body. This utility model, by setting a heating element inside the feeding rod, facilitates cooperation with the heating mechanism outside the barrel to uniformly heat the plastic particles inside the barrel until they melt, improving injection molding efficiency. Furthermore, the heating element and the feeding rod, as well as the feeding rod and the barrel, are detachable, facilitating disassembly and maintenance, and providing convenience for use.

The application discloses a manufacturing method of a plum-blossom liquid pump stator, which comprises the following steps: S1, metal body casting forming, S2, first injection molding monomer and second injection molding monomer installation, S3, upper mold installation, S4, engineering plastic layer one-time injection molding forming and demolding, and S5, engineering plastic layer secondary injection molding forming and demolding. The application can realize the secondary injection molding forming of the engineering plastic layer, improve the connection strength and stability between the engineering plastic layer and the metal body, prevent the engineering plastic layer from falling off in the injection molding process and affecting the processing quality and stability of the stator, effectively control the deformation amount of the engineering plastic layer, and improve the working stability of the plum-blossom liquid pump.

The utility model discloses an injection mold with an exhaust structure, which comprises a base, the top end of the base is fixedly connected with a lower mold, the top end of the base is fixedly connected with a guide rod, the top end of the guide rod is fixedly connected with an upper mold, and the top end of the upper mold penetrates through and is fixedly connected with an injection pipeline. An exhaust mechanism is arranged at the top end of the upper mold, air passing through the interior is exhausted outwards through an air outlet hole, gas enters the interior of the shell through an air inlet and an air outlet, the gas extrudes a fixing plate, the fixing plate is extruded to drive a rotating rod to rotate in the shell, the rotating rod rotates to drive an extrusion rod to rotate, and the extrusion rod rotates to extrude a stress plate; the stress plate is extruded to move downwards, then the limiting rod is driven to move in the positioning column, the spring is extruded, the spring is in a compressed state, the stress plate drives the knocking block to knock the upper mold, plastic is more evenly distributed in the lower mold, and the injection molding efficiency is improved.