CN110653990A

CN110653990A - Injection molding machine and injection molding process

Info

Publication number: CN110653990A
Application number: CN201811583075.1A
Authority: CN
Inventors: 王海平; 陈德苍; 何从友
Original assignee: Shanghai Zidan Packaging Technology Co Ltd; SHANGHAI ZIDAN FOOD PACKAGING PRINTING CO Ltd
Current assignee: Shanghai Zidan Packaging Technology Co Ltd; SHANGHAI ZIDAN FOOD PACKAGING PRINTING CO Ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2020-01-07
Anticipated expiration: 2038-12-24
Also published as: CN110653990B

Abstract

The invention relates to an injection molding machine and an injection molding process, wherein the injection molding machine comprises a frame, a rotary mold table and N mold closing units, wherein the rotary mold table is arranged on the frame; the rotary die table is rotatably arranged on the rack, two rear die sets are arranged along the circumferential direction of the rotary die table in the rotating direction, each rear die set is provided with N rear dies, each die closing unit comprises a transmission device arranged on the rack and a melt adhesive injection part matched with the transmission device, a front die is arranged on the transmission device, the rotary die table rotates, the front dies on the N die closing units are alternately closed with the N rear dies of the two rear die sets under the driving of the transmission device, the melt adhesive injection part is used for melting plastics and injecting the plastics into a die cavity through the front dies after die closing, and N is an integer not less than 1. Compared with the prior art, the invention can synchronously and alternately carry out multi-die and multi-action, realizes the flow which can not be realized by the conventional injection molding machine and achieves higher working efficiency.

Description

Injection molding machine and injection molding process

Technical Field

The invention relates to the technical field of injection molding, in particular to an injection molding machine and an injection molding process.

Background

The insert is inserted into the injection molded product, which is a common injection molding process for the product. The structural composition and the work cycle mode for producing the insert product of the conventional injection molding machine will be described with reference to fig. 1 to 3. The conventional injection molding machine mainly comprises a frame, a conventional injection unit, a conventional single set of mold (one set of mold generally comprises two halves, one half of the mold is provided with an injection gate and is called as a front mold, the other half of the mold is provided with no gate and is called as a rear mold), a conventional mold closing unit, a controller and a safety protection cover plate, the conventional mold closing unit is divided into a conventional hinged mold closing unit or a conventional direct pressure type mold closing unit (shown in figures 1 and 2) according to different transmission devices, the front part of the mold closing unit is provided with the set of mold, a mechanical hand is matched (or inserts are manually loaded and products are taken out), the middle part of the mold closing unit is provided with an ejection device, and the tail.

The concrete structure is as follows: the die assembly unit mainly comprises a fixed plate, a movable plate, a tail plate, a pull rod, a transmission device (a hinge type or a direct pressure type), an ejection device and a die adjusting device; the die adjusting device is in gear transmission, a small gear of a driving motor drives a large gear ring, and the large gear ring drives die adjusting nuts on the four pull rods to rotate to adjust the die assembling position. The injection unit is mainly composed of a screw barrel assembly, a motor transmission assembly and an injection transmission assembly (fig. 1 and 2).

The working process is as follows: the mold closing unit closes the mold to form a product mold cavity; then the injection nozzle is pushed against the sprue bush of the mould before the injection seat, the plasticizing unit injects the melted resin into the mould cavity, and a certain pressure is kept in the cooling shrinkage period of the mould cavity product, so that the resin is cooled and solidified to form a compact product; in the cooling process of the resin, the plasticizing unit begins to plasticize and store materials for metering, and generates a certain amount of qualified melt which is ready for the next injection; after cooling, the injection seat moves backwards, and the mold closing unit opens the mold; the ejection mechanism ejects the product; the manipulator loads the insert to complete a production cycle (see fig. 3); and then closing the die to carry out the next working cycle.

The conventional injection molding machine duty cycle and structure suffers from four disadvantages in producing insert articles:

first, a conventional injection molding machine can only mount one set of mold.

Secondly, the machine acts sequentially, namely one action is finished and then the next action is carried out, the forming speed is low, and the requirement of mass rapid production cannot be met.

Thirdly, the process of external operation, product taking out and insert loading is carried out, and the injection molding machine is in a waiting loading state, so that the working efficiency is also reduced.

Fourthly, the two ends of the injection and die assembly are arranged, and the space utilization efficiency of a factory is reduced.

Fifthly, for packaging products, the expensive cavity-group hot runner mold is usually used for rapid production, but the manipulator picking time occupies the larger part of the cycle period of the machine, so that the utilization rate of the hot runner mold is lower.

Disclosure of Invention

One purpose of the invention is to provide an injection molding machine, which realizes that a plurality of sets of molds are arranged on one machine, the plurality of sets of molds work synchronously and alternately, avoids the problem that one set of molds of the conventional injection molding machine can not perform injection pressure maintaining cooling when taking products and loading inserts, and improves the utilization rate of front molds (generally hot runner installation molds); further, the injection part is embedded into the mold closing unit, and the space utilization rate is improved.

Another object of the present invention is to provide an injection molding process, which can be performed synchronously and alternately with multiple molds and multiple actions, and which can achieve a process that cannot be achieved by a conventional injection molding machine, thereby achieving higher work efficiency.

A third object of the present invention is to provide various innovative injection molding machine component configurations to ensure stable and reliable operation of the machine.

The present invention provides an injection molding machine, including:

a machine frame, a plurality of guide rails and a plurality of guide rails,

a rotary die table rotatably arranged on the frame, two rear die sets arranged along the circumferential direction of the rotary die table, each rear die set having N rear dies,

the mould closing device comprises N mould closing units, each mould closing unit comprises a transmission device arranged on a rack and a melt adhesive injection part matched with the transmission device, a front mould is arranged on the transmission device, the front mould on the N mould closing units and N rear moulds of two rear mould groups are alternatively closed under the driving of the transmission device in the rotating process of a rotary mould table, and the melt adhesive injection part is used for melting plastics and injecting the plastics into a mould cavity through the front mould after mould closing;

and N is an integer not less than 1.

Preferably, N is an integer not less than 2, and the rear molds of the two rear mold sets are alternately arranged along the circumferential direction of the rotating direction of the rotary mold table and are uniformly distributed.

Preferably, N is 2, two rear molds of each rear mold set are symmetrically arranged, and two mold clamping units are symmetrically arranged relative to the rotary mold table.

Preferably, the rotary die table has a hexahedron with a square cross section, the hexahedron rotates around a straight line where a connecting line of centers of the upper surface and the lower surface of the hexahedron is located, and the rear dies of the two rear die sets are respectively connected to two groups of opposite side surfaces of the hexahedron.

Preferably, the rotary die table is provided with 2N ejection devices respectively matched with the rear dies.

Preferably, the melt adhesive injection part comprises a melt adhesive part and an injection part, the injection part is embedded in the transmission device, and the melt adhesive part is arranged on one side of the transmission device, is connected with the injection part through bridging and follows the injection part.

The invention also provides an injection molding process of the injection molding machine, which comprises the following steps:

s1: the front molds on the N mold closing units are respectively closed with the N rear molds of the corresponding rear mold groups under the driving of the transmission device, and the molten plastic injection part melts the plastic and injects the plastic into the mold cavity through the front molds to perform injection molding of the workpiece;

s2: opening the mold;

s3: rotating the die table to exchange the positions of the two rear die sets;

s4: taking out the product;

s5: steps S1 to S4 are executed in a loop.

Preferably, step S4 and step S1 are performed synchronously.

Preferably, step (4) further comprises the step of loading the insert on the rear mold after removing the article.

The invention sets the rotary die table, the rear die matched with the front die can be changed once per rotation, so that the rear dies and the front dies of the two rear die sets are alternatively matched (for example, when N is 2, the front dies on the two front die units move oppositely from two sides of the machine and are matched with two cold half dies of the corresponding rear die set on the rotary die table), and the rear dies operate alternately. When the rear die of a rear die set is matched with the front die for injection molding, the other rear die set takes a piece, and the piece taking and the injection are synchronous. Therefore, the alternate and synchronous working mode (preferably, when N is 2, the four-mode alternate and synchronous working mode is pairwise), not only is the efficiency and the yield of the machine improved, but also the utilization rate of the front mold is improved.

When N is an integer not less than 1, a plurality of rear molds of each rear mold set are simultaneously closed, and the injection efficiency can be greatly improved. For example, when N is 2, the work efficiency can be increased by a factor of two compared to a conventional injection molding machine.

In the invention, the rotary die table is arranged in the middle, and the die closing units are arranged around the rotary die table (when N is 2, the die closing units are symmetrically arranged on two sides of the rotary die table), so that the space utilization rate of a factory is high.

The present invention also provides a rotary die table for an injection molding machine, comprising:

the polyhedron is rotatably arranged, is provided with 2N side vertical surfaces which are uniformly distributed along the circumferential direction of the rotating direction and is used for fixing two rear die sets, each rear die set is provided with N rear dies, and the N rear dies of the two rear die sets are used for being alternately matched with the N front dies in the rotating process of the polyhedron;

and N is an integer not less than 1.

As a preferred technical scheme, N is an integer not less than 2, and the back dies of the two back die sets are alternately arranged along the circumferential direction of the rotating direction of the rotary die table and are uniformly distributed.

As a preferred technical scheme, N is 2, the polyhedron is a hexahedron and has four side elevation surfaces, and two rear molds of each rear mold set are symmetrically arranged on two opposite side elevation surfaces;

this rotary die platform still includes:

a frame type support which is enclosed outside the hexahedron and is fixedly arranged,

a heavy-load rotary component for the rotary connection of the hexahedron and the frame type support,

the embedded unloading external member is composed of a groove flange, a flange and a suspender mechanism for connecting the groove flange and the flange, the groove flange is fixed on the frame type support and is provided with a groove the length direction of which is parallel to the linear direction of the two front molds, the flange is embedded and connected with the groove flange and can move relative to the groove flange along the length direction of the groove,

and the rotary module rotating assembly is fixed on the flange and penetrates through the flange to be in transmission connection with the heavy-load rotary assembly.

The groove flange and the flange are embedded, so that the freedom degree of the power component is limited, the rotation moment of the power component is borne, and the power component is allowed to slightly displace along the mold closing direction; when the hexahedron of the rotary die table rotates and starts high-pressure die assembly, the hexahedron is subjected to dozens of tons to hundreds of tons of die assembly force, the transmission and fixing piece deforms, and therefore the power component can generate a small amount of displacement along the die assembly direction.

As a preferred technical scheme, the frame type support consists of four upright posts surrounded outside a hexahedron, and a rotary die pedestal and a rotary die rack which are respectively positioned at the bottoms and the tops of the four upright posts; the heavy-load rotating assembly is used for rotationally connecting the hexahedron with the frame-type supported rotating die pedestal and the rotating die rack; the groove flange is fixed at the bottom of the rotary die pedestal.

As a preferred technical scheme, the heavy-load rotating assembly comprises an upper flange shaft connected to the top of the hexahedron and penetrating through the rotary die rack, an upper heavy-load copper sleeve arranged between the rotary die rack and the upper flange shaft, an upper flange cover arranged on the rotary die rack and matched with the upper flange shaft, an upper thrust bearing arranged between the upper flange cover and the upper flange shaft, a lower flange shaft connected to the bottom of the hexahedron and penetrating through the rotary die rack, a lower heavy-load copper sleeve arranged between the rotary die rack and the lower flange shaft, and a lower thrust bearing arranged between the groove flange and the lower flange shaft. During work, the upper heavy-load copper bush and the lower heavy-load copper bush bear heavy-load mold clamping force.

As the preferred technical scheme, the rotary die table rotating assembly consists of a rotary die servo motor, a rotary die speed reducer and a rotary die transmission shaft which are in transmission connection, and the rotary die transmission shaft is connected with the heavy-load rotating assembly.

As a preferred technical scheme, the hexahedron is provided with four ejection devices which are respectively matched with the four rear molds, the four ejection devices are respectively provided with an ejection servo motor and an ejector pin rod which are arranged in an offset mode and are in transmission connection, and the four ejection devices are installed in a staggered mode, so that the four ejector pin rods are distributed in a cross shape and are respectively located in the centers of four side vertical surfaces of the hexahedron. The ejection servo motor is installed and driven in an offset way relative to the ejector pin rod, so that the ejection servo motor and the ejector pin rod are parallel but not coaxial, and four groups of independent ejection devices can be installed in a staggered way in narrow inner cavities in the hexahedron.

According to the preferable technical scheme, the ejection servo motor of the ejection device is connected with a screw portion of the thimble ball screw through a coupler, the front end and the rear end of the screw portion are respectively penetrated and arranged on the front mounting plate and the rear mounting plate through thimble screw bearings, a mounting side plate is connected between the front mounting plate and the rear mounting plate to form an Contraband-shaped structure, a rolling guide rail parallel to the screw portion is further arranged between the front mounting plate and the rear mounting plate, a nut portion of the thimble ball screw is connected with an ejector plate penetrating and arranged on the rolling guide rail, the thimble rod penetrates and arranged on the front mounting plate, and the rear end of the thimble rod is fixed on the ejector plate.

The working principle of the rotary die table is as follows: the rear molds are arranged on the side vertical surfaces of the polyhedron of the rotary mold table, and the rear molds of the two rear mold groups are alternatively matched with the front mold through rotation. The rotary die table rotates after injection molding, a rear die set which completes injection molding is rotated out of a die assembly area, and a finished product is ejected; and when the mold is rotated out to eject the finished product, the other rear mold group is rotated into a mold clamping area to perform a synchronous injection process. The injection molding efficiency can be greatly improved through the rotary die table.

Particularly, when the two rear modules of the invention are composed of two symmetrically arranged rear modules, the two front modules are symmetrically arranged relative to the rotary module platform, when the modules are closed, the two front modules move oppositely from two sides to be closed with the rear modules on two symmetrical side elevation surfaces, and the rotary module platform rotates 90 degrees after injection molding to rotate the rear modules which finish injection molding out of a mold closing area to eject finished products; and when the mold is rotated out to eject a finished product, two rear molds of the other rear mold group are rotated into the mold clamping area to carry out a synchronous injection process. The injection molding efficiency is high, the stress is more reasonable during mold closing, the arrangement is more scientific, and the occupied space of the equipment can be greatly reduced.

The invention also provides a transmission device for a mold closing unit of an injection molding machine, which comprises a guide rail, a movable plate, a tail plate, a boosting transmission assembly and a driving assembly, wherein the movable plate is slidably connected with the guide rail, the tail plate is fixed on the guide rail, the boosting transmission assembly is connected between the movable plate and the tail plate, the driving assembly acts on the boosting transmission assembly, the movable plate is connected with a front mold and is provided with an inner cavity for embedding an injection part.

Preferably, the boosting transmission assembly adopts a crank-link mechanism and comprises a crank and a long link which are in transmission connection, the free end of the crank is connected with the tail plate, the free end of the long link is connected with the moving plate, and the driving assembly acts on the crank.

As a preferred technical solution, the driving assembly includes:

a middle plate arranged on the guide rail and positioned between the moving plate and the tail plate,

a ball screw is driven, a screw part is arranged on the tail plate and the middle plate in a penetrating way through a bearing, a nut seat is arranged on the nut part, the nut seat is connected with a short connecting rod and acts on the boosting transmission component through the short connecting rod,

and the driver is in transmission connection with the screw part and is used for driving the screw part to rotate.

Preferably, the boosting transmission assemblies are arranged on two sides of the transmission ball screw symmetrically. The nut seat adopts a cross nut seat and is provided with two wings which are symmetrical relative to the transmission ball screw, and the two wings of the cross nut seat are both connected with short connecting rods and act on the two boosting transmission assemblies through the short connecting rods.

As the preferred technical scheme, the transmission ball screw adopts a heavy-load large-steel ball screw.

Preferably, the driver includes a mold clamping servo motor fixed to the tail plate, a driving synchronous pulley provided on an output shaft of the mold clamping servo motor, a driven synchronous pulley provided on the screw portion, and a synchronous belt for connecting the driving synchronous pulley and the driven synchronous pulley.

According to a preferable technical scheme, the tail end of the screw portion penetrates through the tail plate and is located behind the tail plate, the driven synchronous belt wheel is arranged at the tail end of the screw portion, the die closing servo motor is arranged on the side face of the tail plate, the output shaft faces the rear of the tail plate, and the synchronous belt is located behind the tail plate.

As the preferred technical scheme, the screw rod part is respectively arranged on the tail plate and the middle plate in a penetrating way through a positioning bearing and a centripetal thrust bearing.

As a preferred technical scheme, the guide rail is composed of four pull rods which are distributed in a rectangular shape and penetrates through four corners of the movable plate, the tail plate and the middle plate.

The tail plate and the moving plate of the transmission device are used for locking the mold and amplifying force through a boosting transmission assembly, preferably a crank-link mechanism. The die-closing servo motor drives the transmission ball screw to rotate through belt transmission, pushes the cross nut seat to move forward or backward, and further pulls the crank link mechanism to enable the moving plate to stably perform die-closing and die-opening actions at a high speed. The positioning bearing and the radial thrust bearing are combined to form a high-rigidity support of the ball screw, and the ball screw can be allowed to rotate at a high speed. The injection mold closing is arranged at the same end, so that the utilization efficiency of the factory space is greatly improved.

The present invention also provides a nozzle for an injection part of an injection molding machine, comprising:

the nozzle body is internally provided with a fluid channel,

an injection screw inserted in the rear of the fluid passage and movable in the axial direction,

a bridging connection hole communicated with the fluid passage in front of the injection screw for connecting the bridging and receiving the melt adhesive through a melt adhesive passage provided inside the bridging,

and the nozzle switch is used for switching the communication of the front and rear fluid channels of the bridging connecting hole and the communication of the rear fluid channel of the bridging connecting hole and the bridged glue melting channel.

As a preferred technical scheme, the nozzle switch comprises a rotary valve core and a valve core driving assembly for driving the rotary valve core to rotate, the rotary valve core is inserted at the joint of the fluid channel and the bridging connecting hole, and the rotary valve core is provided with three through holes for switching the communication between the fluid channel in front of and behind the bridging connecting hole and the communication between the fluid channel behind the bridging connecting hole and the bridged glue melting channel.

As a preferable technical scheme, the three-way hole is T-shaped, and the valve core driving assembly is used for driving the rotary valve core to do reciprocating swing of 90 degrees.

As a preferred technical scheme:

when the front and rear fluid channels of the bridging connecting hole are communicated, two through holes oppositely arranged in the three-way hole communicate the front and rear fluid channels of the bridging connecting hole, and the other through hole is opposite to the bridging connecting hole;

when the fluid passage behind the bridging connecting hole is communicated with the bridged glue melting passage, the two mutually vertical through holes in the three-way hole communicate the fluid passage behind the bridging connecting hole with the bridged glue melting passage, and the other through hole is back to the bridging connecting hole.

As a preferred technical scheme, the rotary valve core is provided with a plurality of damping grooves, an aggregate channel is arranged in the rotary valve core, the inlet end of the aggregate channel is communicated with the damping grooves through small holes arranged in one damping groove, and the outlet end of the aggregate channel is communicated with the end part of the rotary valve core.

As a preferred technical scheme, the rotary valve core is vertically arranged, the bottom end of the rotary valve core penetrates through the nozzle body and is positioned below the nozzle body, and the outlet end of the aggregate pore channel is communicated with the bottom end of the rotary valve core. The gap residue is convenient to discharge.

As a preferred technical scheme, the valve core driving assembly comprises a crank connecting rod mechanism and a jet nozzle switch cylinder which are sequentially connected with the rotary valve core.

As a preferable technical scheme, the fluid channel is composed of a nozzle cavity and an injection cavity which are communicated in tandem, a bridging connecting hole is arranged at the connecting position of the nozzle cavity and the injection cavity, and the shape of the injection cavity is matched with that of an injection screw.

As a preferable technical scheme, a plurality of unloading grooves are formed in the part, extending into the fluid channel, of the injection screw. The unloading groove can effectively limit the leakage of molten glue under high pressure and has high pressure resistance.

As a preferable technical scheme, the injection screw is in a pointed cylindrical structure, and the unloading groove is formed in the cylindrical part of the injection screw.

As a preferred technical scheme, the injection screw is provided with a discharge channel, the inlet end of the discharge channel is communicated with an unloading groove through a small hole arranged in the unloading groove, and the outlet end is positioned at the rear part of the injection screw. The leakage molten gel is discharged in a directional manner by arranging the discharging pore channel. The melten gel of injection screw rod end is through leaking the renewal, effectively avoids screw rod head bedding and padding to be detained for a long time and degrades the problem of polluting the product.

Preferably, the rear end of the injection screw is provided with a groove-shaped journal, and the groove-shaped journal is used for being connected with an element for driving the injection screw to act so as to realize the loosening function.

As a preferable technical scheme, the nozzle body consists of a nozzle flange and a nozzle part connected to the front end of the nozzle flange, and the joint of the fluid channel and the bridging connecting hole is positioned on the nozzle flange.

As a preferable technical proposal, the nozzle part is externally coated with a heater.

The present invention also provides an injection component for an injection molding machine, comprising: the injection unit, the nozzle connected to one end of the injection unit and the injection moving unit used for driving the injection component to move;

the injection unit consists of a box body, a ball screw transmission assembly arranged in the box body and a servo motor assembly used for driving the ball screw transmission assembly to act,

the injection nozzle is connected to the front end of the injection unit, and the ball screw transmission assembly is in transmission connection with the injection screw through the injection force sensor and drives the injection screw to reciprocate.

As a preferred technical solution, the ball screw transmission assembly includes:

the injection ball screw is provided with a ball screw,

the injection transmission shaft is of a hollow structure, is sleeved outside the nut part of the injection ball screw, is rotatably connected with the box body and is used for being in transmission connection with the servo motor component,

and the guide plate is connected to the front end of the screw part of the injection ball screw, is in sliding connection with the box body through the injection guide rail and is used for driving the injection screw to reciprocate.

As the preferred technical scheme, the rear end of the injection screw is connected with a screw connecting seat, and the injection force sensor is arranged between the guide plate and the screw connecting seat.

Preferably, the guide plate is connected at its center to a screw portion of the injection ball screw, and the injection guide rail is composed of two slide rails symmetrically disposed with respect to the screw portion of the injection ball screw.

As the preferred technical scheme, the injection transmission shaft is rotatably connected with the box body through a centripetal thrust bearing and an unloading bearing which are sleeved at the front part and the rear part of the injection transmission shaft respectively.

As a preferable technical scheme, the rear end of the injection transmission shaft extends backwards and extends out of the box body to be in transmission connection with the servo motor assembly.

As a preferred technical scheme, the servo motor assembly comprises an injection servo motor fixedly arranged relative to the box body and an injection synchronous belt assembly used for driving and connecting an output shaft of the injection servo motor and an injection transmission shaft.

As a preferred technical scheme, the injection synchronous belt assembly comprises an injection large synchronous pulley sleeved at the rear end of the injection transmission shaft, an injection driving synchronous pulley connected to an output shaft of the injection servo motor, and an injection synchronous belt used for connecting the injection large synchronous pulley and the injection driving synchronous pulley.

As a preferable technical scheme, the injection servo motor is fixed on one side of the outer part of the box body through an injection motor seat.

As a preferred technical solution, the shooting and moving unit includes:

a shooting and moving base slide carriage arranged on the box body,

a shooting moving base guide rail pair used for sliding the shooting moving base slide carriage,

and the tensioning cylinder is used for connecting the box body and a moving plate of the injection molding machine, so that the injection nozzle is tightly attached to the front mold during injection.

The injection part working process comprises the following steps: the tensioning cylinder moves the whole injection part to make the injection nozzle part tightly abut against the injection gate of the mould or separate from the injection gate. When the machine controller sends a signal for injection, the nozzle switch cylinder drives the rotary valve core to rotate by 90 degrees, so that the nozzle part is communicated with the injection cavity; the injection servo motor rotates, and drives the injection ball screw through belt transmission, generally, a heavy-duty large steel ball screw is adopted to rotate, and the guide plate pushes the injection screw to advance along the injection guide rail through the injection force sensor to inject and maintain pressure. The injection force is controlled in a closed loop mode by a controller of an injection servo motor and an injection force sensor. After injection is finished, the jet nozzle switch cylinder drives the rotary valve core to rotate for 90 degrees, the injection cavity is communicated with the melt adhesive component, and the melt coming from the melt adhesive component pushes the injection screw to retreat. Under the closed-loop control of the force sensor, the retreating resistance, namely the back pressure, of the injection screw during glue melting can be accurately controlled.

The injection parts are coaxially arranged into a whole, and an external part linearly moves along with the screw rod without a conventional injection platform; the injection pressure and the glue pressure (i.e. back pressure) during glue melting and storing are controlled in a closed loop mode through a force sensor and a servo control system; the rotary valve core is vertically arranged, so that gap residue can be conveniently discharged.

The present invention also provides a melt adhesive part for an injection molding machine, comprising:

a charging barrel which is provided with a feeding port and is externally wrapped with a heating barrel,

a bridge which is vertically connected with the front end of the charging barrel, is communicated with the charging barrel and is used for being connected with an injection component to provide molten rubber, and the outside of the bridge is wrapped with a heating barrel,

a melt glue screw rod which is arranged in the charging barrel in a penetrating way,

a melt adhesive screw driving component for driving the melt adhesive screw to rotate,

and the glue melting component moving assembly is used for following the glue melting component and the injection component.

As a preferred technical scheme, the bridge is vertically connected to the front end of the charging barrel through a right-angle flange.

As the preferred technical scheme, the melting component further comprises a melting rubber bearing seat and a charging barrel seat which are detachably connected, the tail end of the charging barrel is fixed on the charging barrel seat, the tail end of the melting rubber screw is connected with a bearing through a connecting flange, the bearing is rotatably connected with the melting rubber bearing seat, and a melting rubber screw driving assembly is arranged on the melting rubber bearing seat and is in transmission connection with the melting rubber screw.

As an optimized technical scheme, the melt adhesive screw driving assembly comprises a melt adhesive servo motor and a melt adhesive speed reducer which are in transmission connection, and the melt adhesive speed reducer is in transmission connection with the melt adhesive screw through a melt adhesive transmission shaft.

As preferred technical scheme, the melten gel part remove subassembly include the melten gel support and set up the melten gel guide rail pair on the melten gel support, melten gel bearing frame and feed cylinder seat all with the vice sliding connection of melten gel guide rail. The glue melting component slides along the guide rail pair under the driving of the injection component, so that the synchronous movement with the injection component is realized.

As the preferred technical scheme, the melting component also comprises a melting screw rod moving cylinder, and a cylinder body and a cylinder rod of the melting screw rod moving cylinder are respectively connected with a melting bearing seat and a charging barrel seat. The glue melting screw rod moving cylinder can axially move the glue melting screw rod, and the glue melting screw rod moving cylinder assists in working when stopping to clean residual glue and disassemble and assemble the glue melting screw rod.

As a preferred technical solution, the melting glue part further comprises a plurality of melting glue thermocouples for measuring the temperature of the charging barrel. The heating cylinder is matched with the glue melting thermocouple to accurately control the temperature of the charging cylinder, preheat plastic particles and preserve heat.

The working principle of the glue melting component is as follows: during the melten gel, the section of thick bamboo that generates heat makes feed cylinder, right angle flange, bridging preheat to the assigned temperature, and melten gel screw rod drive assembly drives the melten gel screw rod rotatory, makes solid-state plastics constantly get into the feed cylinder from the pan feeding mouth, heats, extrudees, cuts, and the plastify melts into the fuse-element. The melt was extruded through right angle flanges, bridges into the injection part.

According to the invention, the melt adhesive part is separated from the conventional melt adhesive injection part and is connected with the other injection part in a bridging manner, and in practice, the melt adhesive part is preferably arranged on one side of the injection part, namely the melt adhesive part and the injection part are arranged in parallel and move synchronously; the glue melting action is independent of other actions such as injection, mold closing and the like, so that the glue can be synchronously melted in other actions, the glue is prevented from occupying cycle time, and the efficiency is improved.

The invention also provides a mold adjusting device for the mold closing unit of the injection molding machine, which is arranged on a tail plate of the mold closing unit of the injection molding machine and used for driving the mold closing unit to move relative to a guide rail consisting of a plurality of pull rods.

As a preferable technical scheme, a front flat thrust bearing and a rear flat thrust bearing are respectively arranged on the front side and the rear side of the belt sprocket die adjusting nut.

Preferably, the gear motor is arranged on the tail plate through a motor seat, the chain is driven to move through the small driving chain wheel, the motor seat can rotate around the small driving chain wheel, the small driven chain wheel is further arranged on the motor seat, and the small driven chain wheel is eccentrically arranged on the motor seat relative to the small driving chain wheel.

As the preferred technical scheme, each die adjusting nut with the chain wheel is positioned at the inner side of the chain, and the driven small chain wheel and the driving small chain wheel are respectively arranged at the inner side and the outer side of the chain.

Preferably, the tail plate is further provided with an idler wheel, and the idler wheel is positioned outside the chain. The idler wheel is used for being matched with the driven small chain wheel and the driving small chain wheel to tension the chain.

As a preferred technical scheme, the guide rail is composed of four rectangular pull rods, and the die adjusting nuts with chain wheels on two adjacent pull rods are a group and share one clamping plate.

As a preferable technical scheme, the die adjusting device further comprises two travel switches and a pressure lever, wherein the two travel switches are located on one side of the tail plate and are arranged along the length direction of the pull rod, and the pressure lever is connected to the tail plate and is located between the two travel switches. The travel switch is matched with the pressure rod and used for limiting the die adjusting travel.

The mold adjusting device is arranged on the tail plate and used for moving the whole mold closing unit when replacing molds with different thicknesses, so that the molds can be just clamped when being closed, and a proper mold locking force is achieved. The working principle is as follows:

the gear motor drives the driving small chain wheel to rotate and drag the chain), so that the four die adjusting nuts with the chain wheels rotate. The adjusting die nut with the chain wheel is screwed with the pull rod and clamped between the clamping plate and the tail plate. The distance between the clamping plate and the tail plate is determined by the fixed distance fixing rod, so that a reasonable gap (generally 0.1mm) between the die adjusting screw nut with the chain wheel and the clamping plate and the tail plate is ensured, and the die adjusting screw nut can freely rotate relative to the tail plate at a fixed distance. Therefore, the adjusting die nut with the chain wheel rotates to enable the tail plate to move along the pull rod, the clamping position of the moving plate is changed, and the purpose of adjusting the thickness of the die is achieved. The driven small chain wheel is arranged on the die adjusting motor seat and used for tensioning the chain. The tensioning method comprises the following steps: the small driving chain wheel is used as the center to rotate the die adjusting motor seat, so that the small driven chain wheel deflects and compresses the chain to achieve the tensioning purpose. Every two belt sprocket die adjusting nuts share one clamping plate, and the die adjusting process is not easy to clamp. The whole die adjusting device is simple, efficient and stable.

Compared with the prior art, the invention can realize that a plurality of sets of moulds are arranged on one machine, and the plurality of sets of moulds work synchronously and alternatively, thereby avoiding the problem that one set of moulds of the conventional injection molding machine can not perform injection pressure-maintaining cooling when taking products and loading inserts, improving the utilization rate of the moulds, particularly the front mould of the hot runner mould, improving the stability of the machine and the utilization rate of the factory space, and reducing the labor. The injection molding process can be synchronously and alternately carried out by multiple molds and multiple actions, realizes the flow which cannot be realized by the conventional injection molding machine, and achieves higher working efficiency.

Drawings

FIG. 1 is a schematic view of a conventional hinge-type split injection molding machine;

fig. 2 is a schematic structural view of a conventional direct-compression type mold clamping type injection molding machine;

FIG. 3 is a timing diagram illustrating the operation mode and operation of a conventional injection molding machine; in the figure, the horizontal axis represents time, and the vertical axis represents machine action;

FIG. 4 is a schematic structural view of an injection molding machine according to the present invention;

fig. 5 is a schematic view of an injection molding machine according to embodiment 1 of the present invention;

FIG. 6 is a timing chart showing the operation mode and operation of the injection molding machine according to embodiment 1 of the present invention; in the figure, the horizontal axis represents time, and the vertical axis represents machine action;

fig. 7 is a schematic front view (a) and a schematic top view (b) of an injection molding machine according to embodiment 1 of the present invention;

FIG. 8 is a schematic structural view (a) of a transfer table according to embodiment 1 of the present invention and a schematic sectional view (b) taken along line D-D in FIG. 1;

fig. 9 is a schematic sectional view (a) of the ejection device, a schematic elevation view (b) of four ejection devices, a schematic side view (c) of four ejection devices, and a schematic top view (d) of four ejection devices according to embodiment 1 of the present invention;

FIG. 10 is a schematic structural view (a) of a clamping unit according to embodiment 1 of the present invention and a schematic sectional view (b) taken along line E-E in FIG. 1;

fig. 11 is a schematic structural view (a) of a transmission of a clamping unit according to embodiment 1 of the present invention and a schematic structural view of a section D-D in fig. (a);

FIG. 12 is a schematic view of the structure of an injection part according to example 1 of the present invention (a) and a schematic view of a D-D section in FIG. (a);

FIG. 13 is a schematic view of the structure of a nozzle in example 1 of the present invention;

FIG. 14 is a schematic view showing the structure of an injection screw according to example 1 of the present invention;

FIG. 15 is a schematic structural view of a glue-melting part according to embodiment 1 of the present invention (a) and a schematic structural view of a D-D section in FIG. (a);

fig. 16 is a schematic front view (a) and a schematic side view (b) of a mold adjustment device according to embodiment 1 of the present invention.

In the figure, 1 is a rotary die table, 21 is a rear die, 22 is a front die, 3 is a die assembly unit, 4 is a controller, 5 is a safety protective cover plate, 6 is a frame, 7 is a conventional injection unit, 8 is a conventional single set of die, 9 is a conventional hinge type die assembly unit, 10 is a conventional direct pressure type die assembly unit, 11 is an ejection device, 12 is an embedded unloading kit, 1a is a column, 1b is an upper heavy-load copper sleeve, 1c is an upper flange cover, 1d is an upper thrust bearing, 1e is an upper flange shaft, 1f is a hexahedron, 1g is a rotary die table frame, 1h is a lower flange shaft, 1i is a lower thrust bearing, 1j is a rotary die transmission shaft, 1k is a rotary die reducer, 1m is a rotary die servo motor, 1n is a rotary die table base, 1p is a lower heavy-load copper sleeve, 1q is a groove flange, 1r is a flange, 1s is a flange, 11a servo motor, 11b is a coupler, 11c is a rear mounting plate, 11d is an ejector ball screw, 11e is a mounting side plate, 11f is a front mounting plate, 11g is an ejector pin bearing, 11h is a rolling guide rail, 11i is an ejector pin rod, 11j is an ejector plate, 31 is a transmission device, 32 is an injection part, 33 is a molten rubber part, 34 is a mold adjusting device, 31a is a draw bar, 31b is a moving plate, 31c is a long link, 31d is a crank, 31e is a tail plate, 31f is a mold closing servo motor, 32f1 is an unloading groove, 31g is a driving synchronous pulley, 31h is a synchronous belt, 31i is a positioning bearing, 31j is a coupling pin shaft, 31k is a short link, 31m is a cross nut seat, 31n is a transmission ball screw, 31p is a middle plate, 31q is a radial thrust bearing, 31u is a driven synchronous pulley, 32a is a nozzle portion, 32b is a heater, 32c is a nozzle flange, and 32d is a rotary valve core, 32d1 is a damping slot, 32e is a nozzle thermocouple, 32f is an injection screw, 32f1 is an unloading slot, 32f2 is a discharge hole, 32f3 is a discharge hole, 32f4 is a groove-shaped journal, 32g is a box body, 32h is an injection force sensor, 32i is a guide plate, 32j is a centripetal thrust bearing, 32k is an injection transmission shaft, 32m is an unloading bearing seat, 32n is an unloading bearing, 32p is an injection ball screw, 32q is a large injection synchronous pulley, 32r is an injection synchronous belt, 32s is an injection motor seat, 32t is an injection servo motor, 32u is a nozzle base guide rail pair, 32v is a nozzle base slide plate, 32w is a tensioning cylinder, 32x is a nozzle switch cylinder, 32y is an injection guide rail, 32z is a screw connecting seat, 33a is a bridge, 33b is a right-angle flange, 33c is a melt adhesive thermocouple, 33d is a melt adhesive temperature control box, and 33e is a charging barrel, 33f is a melt adhesive screw, 33g is a heating cylinder, 33h is a cylinder seat, 33i is a connecting flange, 33j is a melt adhesive bearing seat, 33k is a melt adhesive speed reducer, 33m is a melt adhesive servo motor, 33n is a melt adhesive transmission shaft, 33p is a melt adhesive screw moving cylinder, 33r is a melt adhesive guide rail pair, 33s is a melt adhesive support, 34a is a driving small sprocket, 34b is a driven small sprocket, 34c is a belt sprocket die adjusting nut, 34d is a fixed distance fixing rod, 34e is a clamping plate, 34f is a chain, 34g is an idler, 34h is a gear motor, 34i is a die adjusting motor seat, 34j is a pressing rod, 34k is a switch seat, 34m is a travel switch, 34q is a front flat thrust bearing, and 34r is a rear flat thrust bearing.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1

An injection molding machine, as shown in fig. 4 to 5, comprises a frame 6, a rotary mold table 1 and N mold closing units 3, wherein: the rotary die table 1 is rotatably arranged on the rack 6, two rear die sets are arranged along the circumferential direction of the rotary die table in the rotating direction, and each rear die set is provided with N rear dies 21; each mold closing unit 3 comprises a transmission device 31 arranged on the rack 6 and a molten glue injection part matched with the transmission device, a front mold 22 is arranged on the transmission device 31, the rotary mold table 1 rotates, the front molds 22 on the N mold closing units 3 are alternately closed with the N rear molds 21 of the two rear mold groups under the driving of the transmission device 31, and the molten glue injection part is used for melting plastics after mold closing and injecting the plastics into a mold cavity through the front molds 21; the value of N is an integer not less than 1. More preferably, N is an integer not less than 2, and the rear molds 21 of the two rear mold assemblies are alternately arranged in the circumferential direction of the rotation direction of the rotary mold table 1 and are uniformly distributed. The rotary mold table 1 has a mold clamping unit 3 arranged in the middle and around it. Through the arrangement of the rotary die table 1, the rear die 21 matched with the front die 22 is changed once per rotation, so that the rear dies 21 and the front dies 22 of the two rear die sets are alternately matched, and the rear dies alternately operate. When the rear die of a rear die set is matched with the front die for injection molding, the other rear die set takes a piece, and the piece taking and the injection are synchronous. Therefore, the alternative and synchronous working mode is creatively realized, the machine efficiency and the yield are improved, and the utilization rate of the front mold is improved. The frame is also provided with a controller for controlling the action of the injection molding machine and a safety shield plate 5 covering the equipment.

In the embodiment, N is 2, two rear dies 21 of each rear die set are symmetrically arranged, and two die closing units 3 are symmetrically arranged relative to the rotary die table 1. At this time, the front molds of the two front mold units can move from two sides of the machine to each other, and are matched with the two cold mold halves of the corresponding rear mold set on the mold rotating table 1. The four rear molds 21 are in a working mode of alternating every two and synchronizing every two. The overall structure is shown in fig. 7.

In this embodiment, a schematic structural diagram of a rotary mold table 1 for an injection molding machine is shown in fig. 8, where the rotary mold table 1 includes: hexahedron 1f, frame-type support, heavy load gyration subassembly, embedded off-load external member 12 and rotary die table rotating assembly, wherein: the hexahedron 1f can rotate around a straight line where the connecting line of the centers of the upper surface and the lower surface of the hexahedron is located, the hexahedron is provided with four side vertical surfaces, two rear molds 21 of each rear mold group are symmetrically arranged on two opposite side vertical surfaces, and two front molds 22 are symmetrically arranged relative to the rotary mold table; the frame type support is enclosed outside the hexahedron 1f and is fixedly arranged; the heavy-load rotary component is used for rotationally connecting the hexahedron 1f and the frame type support; the embedded unloading external member 12 is composed of a groove flange 1q, a flange 1r and a suspender mechanism for connecting the groove flange 1q and the flange 1r, the groove flange 1q is fixed on a frame type support and is provided with a groove with the length direction parallel to the linear direction of the two front molds 22, the flange 1r is embedded with the groove flange 1q and can move relative to the groove flange 1q along the length direction of the groove, the suspender mechanism is composed of a plurality of suspenders 1s and nuts sleeved on the suspenders 1s, the top end of the suspender 1s is fixed on the groove flange 1q and is positioned at two sides of the flange 1r, and the nuts are used for bearing the flange 1 r; the rotary module of the rotary mould table is fixed on the flange 1r and is connected with the heavy-load rotary module in a transmission way by penetrating through the flange 1 r. The groove flange 1q is embedded with the flange 1r, so that the freedom degree of the power component is limited, the rotation moment of the power component is borne, and the power component is allowed to move slightly along the linear direction when two mold clamping units 3 which are symmetrically arranged relative to the rotary mold table 1 move oppositely along the mold clamping direction; when the hexahedron 1f of the rotary die table 1 rotates and starts high-pressure die assembly, the hexahedron is subjected to dozens to hundreds of tons of die assembly force, the transmission and fixing piece deforms, and therefore the power component can displace a small amount along the die assembly direction, and the sleeve allows the displacement through the embedded groove flange 1q and the flange 1r, so that additional stress of a precise transmission piece on die assembly is avoided. More specifically: as shown in fig. 8 a-b, the frame support in this embodiment is composed of four columns 1a surrounding the hexahedron 1f, and a rotary die table base 1n and a rotary die table frame 1g respectively located at the bottom and top of the four columns 1 a; the heavy-load rotary component is used for rotationally connecting the hexahedron 1f with the frame-type supported rotary die pedestal 1n and the rotary die rack 1 g; the groove flange 1q is fixed to the bottom of the rotary die table base 1 n. The heavy-load rotary component comprises an upper flange shaft 1e connected to the top of a hexahedron 1f and penetrating through a rotary die rack 1g, an upper heavy-load copper sleeve 1b arranged between the rotary die rack 1g and the upper flange shaft 1e, an upper flange cover 1c arranged on the rotary die rack 1g and matched with the upper flange shaft 1e, an upper thrust bearing 1d arranged between the upper flange cover 1c and the upper flange shaft 1e, a lower flange shaft 1h connected to the bottom of the hexahedron 1f and penetrating through a rotary die pedestal 1n, a lower heavy-load copper sleeve 1p arranged between the rotary die pedestal 1n and the lower flange shaft 1h, and a lower thrust bearing 1i arranged between a groove flange 1q and the lower flange shaft 1 h. During work, the upper heavy-load copper bush 1b and the lower heavy-load copper bush 1p bear heavy-load mold clamping force. The rotary die table rotating assembly consists of a rotary die servo motor 1m, a rotary die speed reducer 1k and a rotary die transmission shaft 1j which are in transmission connection, and the rotary die transmission shaft 1j is connected with the heavy load rotating assembly. As shown in fig. 9a to d, the hexahedron 1f in this embodiment is further provided with four ejector devices 11 respectively matched with the four rear molds 21, each of the four ejector devices has an ejection servo motor 11a and an ejector pin rod 11i which are offset and in transmission connection, and the four ejector devices are installed in a staggered manner, so that the four ejector pin rods 11i are distributed in a cross shape and are respectively located at the centers of the four side vertical surfaces of the hexahedron 1 f. The ejection servo motor 11a is installed and driven in an offset manner relative to the ejector rod 11i, so that the ejection servo motor 11a and the ejector rod 11i are parallel but not coaxial, and four groups of independent ejection devices 11 can be installed in a staggered manner in the narrow inner cavity of the hexahedron 1 f. More specifically, an ejection servo motor 11a of the ejection device 11 is connected to a screw portion of a thimble ball screw 11d through a coupling 11b, front and rear ends of the screw portion are respectively inserted into a front mounting plate 11f and a rear mounting plate 11c through a thimble screw bearing 11g, a mounting side plate 11e is connected between the front mounting plate 11f and the rear mounting plate 11c, and forms an Contraband-shaped structure, a rolling guide rail 11h parallel to the screw portion is further provided between the front mounting plate 11f and the rear mounting plate 11c, a thimble plate 11j inserted into the rolling guide rail 11h is connected to a nut portion of the thimble ball screw 11d, a thimble rod 11i is inserted into the front mounting plate 11f, and a rear end of the thimble rod 11i is fixed to the thimble plate 11 j. The thimble servo motor 11a drives the thimble ball screw 11d to move the thimble plate 11j forward and backward along the rolling guide rail 11h, and the thimble rod 11i completes the pushing-in and pushing-out operations. The four groups of thimble devices 11 are respectively vertical to four side vertical surfaces of the hexahedron 1f for jacking and retreating.

In the embodiment, by adopting the rotary die table 1 and enabling the two front dies 22 to be symmetrically arranged relative to the rotary die table 1, when die assembly is carried out, the two front dies 22 move oppositely from two sides and are matched with the rear dies 21 on two symmetrical side vertical surfaces, and the rotary die table rotates by 90 degrees after injection molding to rotate the rear die set which completes injection molding out of a die assembly area to eject a finished product; and when the mold is rotated out to eject a finished product, two rear molds of the other rear mold group are rotated into the mold clamping area to carry out a synchronous injection process. The injection molding efficiency is high, the stress is more reasonable during mold closing, the arrangement is more scientific, and the occupied space of the equipment can be greatly reduced.

In the present embodiment, the structure of the transmission device 31 for the clamping unit 3 of the injection molding machine is shown in fig. 10(a) - (b) and fig. 11(a) - (b), and includes a guide rail, a moving plate 31b slidably connected to the guide rail, a tail plate 31e fixed to the guide rail, a force-increasing transmission assembly connected between the moving plate 31b and the tail plate 31e, and a driving assembly acting on the force-increasing transmission assembly, wherein the moving plate 31b is used for being connected to the front mold 22 and has an inner cavity for embedding the injection member 33. More specifically: the boosting transmission assembly adopts a crank-link mechanism and is composed of a crank 31d and a long link 31c which are in transmission connection with a connecting pin shaft 31j, the free end of the crank 31d is connected with a tail plate 31e, the free end of the long link 31c is connected with a moving plate 31b, and the driving assembly acts on the crank 31 d. The driving assembly comprises a middle plate 31p, a transmission ball screw 31n and a driver; the middle plate 31p is arranged on the guide rail and positioned between the moving plate 31b and the tail plate 31e, the transmission ball screw 31n preferably adopts a heavy-load large-steel-ball screw, the screw part of the heavy-load large-steel-ball screw penetrates through the tail plate 31e and the middle plate 31p through a positioning bearing 31i and a centripetal thrust bearing 31q respectively, the nut part is provided with a nut seat, the nut seat is connected with a short connecting rod, and acts on the boosting transmission assembly through the short connecting rod 31 k; the driver is in transmission connection with the screw part and is used for driving the screw part to rotate. The reinforcing transmission assemblies in this embodiment are provided in two, symmetrically disposed on both sides of the transmission ball screw 31 n. The nut seat is a cross nut seat 31m which is provided with two symmetrical wings relative to the transmission ball screw 31n, and the two wings of the cross nut seat 31m are connected with short connecting rods 31k and act on the two boosting transmission assemblies through the short connecting rods 31 k. The actuator in this embodiment includes a mold clamping servomotor 31f fixed to the tail plate 31e, a driving timing pulley 31g provided on an output shaft of the mold clamping servomotor 31f, a driven timing pulley 31u provided on a screw portion, and a timing belt 31h for connecting the driving timing pulley 31g and the driven timing pulley 31 u. In the present embodiment, the tail end of the screw portion of the drive ball screw 31n passes through the tail plate 31e and is located behind the tail plate, the driven synchronous pulley 31u is provided at the tail end of the screw portion, the mold clamping servo motor 31f is provided on the side surface of the tail plate 31e, the output shaft faces behind the tail plate 31e, and the synchronous belt 31h is located behind the tail plate 31 e. The guide rail in this embodiment is composed of four pull rods 31a distributed in a rectangular shape, and is inserted into four corners of the moving plate 31b, the tail plate 31e and the middle plate 31 p.

The end plate 31e and the moving plate 31b of the transmission 31 of the present embodiment are used for clamp locking and force amplification by a power transmission assembly, preferably a crank mechanism. The mold closing servo motor 31f drives the transmission ball screw 31n to rotate through belt transmission, pushes the cross nut seat 31m to move forward or backward, and further pulls the crank link mechanism, so that the moving plate 31b can perform mold closing and opening actions stably at a high speed. The positioning bearing 31i and the angular contact bearing 31q combine to form a highly rigid support for the ball screw, which can allow the ball screw to rotate at high speed. The injection mold is matched and arranged at one end, so that the utilization efficiency of the factory space is greatly improved.

In this embodiment, referring to fig. 16(a) - (b), the mold adjusting device 34 for the mold clamping unit 3 of the injection molding machine is disposed on a tail plate 31e of the mold clamping unit of the injection molding machine, and is used for driving the mold clamping unit to move relative to a guide rail formed by a plurality of pull rods 31a, and includes a gear motor 34h, a chain 34f, and a mold adjusting nut with chain wheel 34c screwed at the tail end of each pull rod 31a, the gear motor 34h drives the mold adjusting nut with chain wheel 34c on each pull rod 31a to synchronously rotate via the chain 34f, and the device further includes a clamp plate 34e, the clamp plate 34e and the tail plate 31e are respectively disposed at two sides of the mold adjusting nut with chain wheel 34c, at least two mold adjusting nuts with chain wheel 34c are a set of one clamp plate 34e, and a fixed rod 34d is connected between the clamp plate 34e and the tail plate 31 e. More specifically: front and rear sides of the die adjustment nut 34c with sprocket in this embodiment are provided with a front flat thrust bearing 34q and a rear flat thrust bearing 34r, respectively. The gear motor 34h is disposed on the tail plate 31e through a motor base 34i, and drives the chain 34f to move through a driving small sprocket 34a, the motor base 34i can rotate around the driving small sprocket 34a, and the motor base 34i is further provided with a driven small sprocket 34b, and the driven small sprocket 34b is disposed on the motor base 34i eccentrically with respect to the driving small sprocket 34 a. The die adjusting nuts 34c with chain wheels are positioned on the inner side of the chain 34f, and the driven small chain wheel 34b and the driving small chain wheel 34a are respectively arranged on the inner side and the outer side of the chain 34 f. In this embodiment, the tail plate 31e is further provided with an idler 34 g. The idler 34g is located outside the chain 34 f. The idler 34g is used to engage with the driven small sprocket 34b and the driving small sprocket 34a to tension the chain 34 f. The guide rail in this embodiment is composed of four rectangular tie rods 31a, and the die adjusting nuts 34c with sprockets on two adjacent tie rods 31a are a group and share a clamping plate 34 e. Further, the mold adjusting device 34 in this embodiment further includes two travel switches 34m located on one side of the tail plate 31e and arranged along the length direction of the pull rod 31a, and a pressing rod 34j connected to the tail plate and located between the two travel switches 34m, and the two travel switches 34m are preferably disposed on a switch seat 34k located on one side of the tail plate 31 e. The travel switch 34m is matched with the pressure rod 34j and used for limiting the die-adjusting travel.

The mold adjusting device 34 of the present embodiment is mounted on the tail plate 31e, and is used to move the entire mold clamping unit when replacing molds of different thicknesses, so that the mold can be properly clamped during mold clamping, and a proper mold clamping force can be achieved. In operation, the gear motor 34h drives the small drive sprocket 34a to rotate, dragging the chain 34f, and rotating the four belt sprocket adjusting nuts 34 c. The belt sprocket adjusting nut 34c is screwed with the tie bar 31a and sandwiched between the clamp plate 34e and the tail plate 31 e. The distance fixing rod 34d determines the distance between the clamping plate 34e and the tail plate 31e, so that the reasonable clearance between the belt sprocket adjusting die nut 34c and the clamping plate 34e and the tail plate 31e is generally 0.1mm, and the belt sprocket adjusting die nut can freely rotate relative to the tail plate 31e at a fixed distance. Therefore, the die adjusting nut 34c with the chain wheel rotates to move the tail plate 31e along the pull rod 31a, so as to change the clamping position of the moving plate 31b and achieve the purpose of adjusting the thickness of the die. The driven small sprocket 34b is mounted on the adjustable motor mount 34i for tensioning the chain 34 f. The tensioning method comprises the following steps: the small driving chain wheel 34a is used as the center to rotate the die-adjusting motor seat 34i, so that the small driven chain wheel 34b deflects and presses the chain 34f to achieve the tensioning purpose. Every two belt sprocket die adjusting nuts 34c share one clamping plate 34e, and the die adjusting process is not easy to clamp. The whole die adjusting device is simple, efficient and stable.

In the present embodiment, the structure of the injection member 32 for an injection molding machine, see fig. 12(a) to (b), includes: an injection unit, a nozzle connected with one end of the injection unit and a shooting moving unit for driving the injection component 32 to move; the injection unit is composed of a box body 32g, a ball screw transmission assembly arranged in the box body 32g and a servo motor assembly used for driving the ball screw transmission assembly to move, the nozzle is connected to the front end of the injection unit, and the ball screw transmission assembly is in transmission connection with an injection screw 32f through an injection force sensor 32h and drives the injection screw 32f to reciprocate. More specifically: the ball screw drive assembly in the present embodiment includes: an injection ball screw 32p, an injection drive shaft 32k, and a guide plate 32 i; the injection transmission shaft 32k is of a hollow structure, is sleeved outside the nut portion of the injection ball screw 32p, is rotatably connected with the box body 32g, and is used for being in transmission connection with the servo motor assembly, and the guide plate 32i is connected to the front end of the screw portion of the injection ball screw 32p, is in sliding connection with the box body 32g through the injection guide rail 32y, and is used for driving the injection screw 32f to reciprocate. Further, a screw coupling seat 32z is coupled to a rear end of the injection screw 32f, and an injection force sensor 32h is disposed between the guide plate 32i and the screw coupling seat 32 z. The guide plate 32i is connected at its center to the screw portion of the injection ball screw 32p, and the injection guide rail 32y is composed of two slide rails symmetrically disposed with respect to the screw portion of the injection ball screw 32 p. The injection transmission shaft 32k is rotatably connected to a case 32g through a radial thrust bearing 32j and an unloading bearing 32n respectively provided at the front and rear portions thereof, and the case 32g is further connected to an unloading bearing seat 32m matched with the unloading bearing 32 n. The rear end of the injection drive shaft 32k extends rearwardly and out of the housing 32g for driving connection with the servo motor assembly. The servo motor assembly includes an injection servo motor 32t fixedly disposed relative to the case 32g and an injection timing belt assembly for drivingly connecting an output shaft of the injection servo motor 32t to the injection drive shaft 32 k. The injection synchronous belt assembly comprises an injection large synchronous belt pulley 32q sleeved at the rear end of the injection transmission shaft 32k, an injection driving synchronous belt pulley connected to an output shaft of the injection servo motor 32t, and an injection synchronous belt 32r used for connecting the injection large synchronous belt pulley 32q and the injection driving synchronous belt pulley. The injection servo motor 32t in this embodiment is fixed to the outer side of the case 32g via an injection motor base 32 s. The shooting and moving unit in the embodiment comprises: a shooting and moving base slide carriage 32v, a shooting and moving base guide rail pair 32u and a tensioning cylinder 32 w; the injection-moving base carriage 32v is provided on the casing 32g, the injection-moving base rail pair 32u is used for sliding the injection-moving base carriage 32v, and the tension cylinder 32w is used for connecting the casing 32g and the moving plate 31b of the injection molding machine so that the injection nozzle is closely attached to the front mold 22 at the time of injection.

The operation of the injection component is as follows: tensioning cylinder 32w moves the entire injection component 32 so that nozzle portion 32a abuts the mold gate or breaks away. When the machine controller sends a signal for injection, the nozzle switch cylinder 32x drives the rotary valve core 32d to rotate by 90 degrees, so that the nozzle part 32a is communicated with the injection cavity; the injection servo motor 32t rotates to drive the injection ball screw 32p through belt transmission, generally, a heavy-duty large steel ball screw is adopted to rotate, and the guide plate 32i pushes the injection screw 32f to advance along the injection guide rail 32y through the injection force sensor 32h for injection and pressure maintenance. The injection force is closed-loop controlled by the controller of the injection servo motor 32t and the injection force sensor 32 h. After the injection is finished, the nozzle switch cylinder 32x drives the rotary valve core 32d to rotate 90 degrees, the injection cavity is communicated with the melt adhesive part 33, and the melt coming from the melt adhesive part 33 pushes the injection screw 32f to retreat. Under the closed-loop control of the force sensor, the backward resistance, i.e., back pressure, of the injection screw 32f during glue melting can be accurately controlled. The injection parts are coaxially arranged into a whole, and an external part linearly moves along with the screw rod without a conventional injection platform; the injection pressure and the glue pressure, namely back pressure, are subjected to closed-loop control during glue melting and storing through a force sensor and a servo control system; the rotary valve core is vertically arranged, so that gap residue can be conveniently discharged.

In the present embodiment, the structure of the nozzle for the injection part 32 of the injection molding machine is shown in fig. 13 to 14, and includes a nozzle body, an injection screw 32f, a bridge connection hole, and a nozzle switch, wherein: the nozzle body is internally provided with a fluid channel and a nozzle thermocouple 32 e; the injection screw 32f is inserted in the rear of the fluid passage and is axially movable; the bridging connection hole is communicated with the fluid passage in front of the injection screw 32f, is used for connecting the bridging 33a, and receives the melt adhesive through a melt adhesive passage arranged inside the bridging 33 a; the nozzle switch is used for switching the communication of the front and rear fluid channels of the bridging connecting hole and the communication of the rear fluid channel of the bridging connecting hole and the melt adhesive channel of the bridge 33 a. More specifically: the nozzle body of this embodiment is composed of a nozzle flange 32c and a nozzle portion 32a connected to the front end of the nozzle flange 32c, and the junction of the fluid passage and the bridging connection hole is located on the nozzle flange 32 c. The nozzle portion 32a is externally covered with a heater 32 b. The nozzle switch in this embodiment includes a rotary valve element 32d and a valve element driving assembly for driving the rotary valve element 32d to rotate, the rotary valve element 32d is inserted at the connection position of the fluid passage and the bridging connection hole, and the rotary valve element 32d is provided with three through holes for switching communication between the fluid passage in front of and behind the bridging connection hole and communication between the fluid passage behind the bridging connection hole and the melt adhesive passage of the bridge 33 a. Preferably, the three through holes are T-shaped, and the valve core driving assembly is used for driving the rotary valve core to do reciprocating swing of 90 degrees. At the moment, when the front and rear fluid channels of the bridging connecting hole are communicated, two through holes oppositely arranged in the three-way hole communicate the front and rear fluid channels of the bridging connecting hole, and the other through hole is opposite to the bridging connecting hole; when the fluid passage behind the bridging connecting hole is communicated with the melt adhesive passage of the bridging 33a, the two mutually perpendicular through holes in the three-way hole communicate the fluid passage behind the bridging connecting hole with the melt adhesive passage of the bridging 33a, and the other through hole is opposite to the bridging connecting hole. The rotary valve core 32d in this embodiment is provided with a plurality of damping grooves 32d1, the rotary valve core 32d is provided with an aggregate pore canal, the inlet end of the aggregate pore canal is communicated with the damping groove 32d1 through a small hole arranged in the damping groove 32d1, and the outlet end is communicated with the end part of the rotary valve core 32 d. Furthermore, in the embodiment, the rotary valve core 32d is vertically arranged, the bottom end of the rotary valve core 32d penetrates through and is positioned below the nozzle body, and the outlet end of the aggregate channel is communicated with the bottom end of the rotary valve core 32 d. The gap residue is convenient to discharge. The valve core drive assembly in this embodiment includes a crank link mechanism and a nozzle switch cylinder 32x connected in sequence to a rotary valve core 32 d. The fluid channel in this embodiment is composed of a nozzle cavity and an injection cavity which are communicated in tandem, the bridging connection hole is arranged at the connection position of the nozzle cavity and the injection cavity, and the shape of the injection cavity is matched with that of the injection screw 32 f. The injection screw 32f has a plurality of relief grooves 32f1 formed in the portion thereof extending into the fluid passage. The relief groove 32f1 can effectively restrict the leakage of molten gel under high pressure, and is highly pressure-resistant. It is further preferred in this embodiment that the injection screw 32f be of a pointed cylindrical configuration with the relief groove 32f1 provided in the cylindrical portion of the injection screw 32 f. And further, the injection screw 32f is provided with a discharge port 32f2, the inlet end of the discharge port 32f2 communicating with the relief groove 32f1 through a small hole provided in a relief groove 32f1, and the outlet end, i.e., the drain hole 32f3, located at the rear of the injection screw 32 f. The discharge port 32f1 is provided to discharge the leaking melt in a directional manner. The molten rubber at the end of the injection screw 32f is updated through leakage, so that the problem that the padding of the screw head is retained for a long time to degrade and pollute the product is effectively avoided. The rear end of the injection screw 32f of this embodiment is also provided with a slotted journal 32f 4. The slotted journal 32f4 is adapted to couple to a member that drives the action of the injection screw 32f, thereby performing a loosening function.

In the present embodiment, the structure of the melt adhesive part 33 for the injection molding machine is shown in fig. 15(a) to (b), and includes a barrel 33e, a bridge 33a, a melt adhesive screw 33f, a melt adhesive screw drive assembly, and a melt adhesive part moving assembly, wherein: the charging barrel 33e is provided with a feeding port, and the heating barrel 33g is wrapped outside the charging barrel; the bridge 33a is vertically connected to the front end of the barrel 33e, is communicated with the barrel 33e and is used for being connected with the injection part 32 to provide molten glue, and the heating barrel 33g is wrapped outside the bridge 33 a; the melting glue screw 33f penetrates through the charging barrel 33e, the melting glue screw driving assembly is used for driving the melting glue screw 33f to rotate, and the melting glue part moving assembly is used for following the melting glue part 33 and the injection part 32. More specifically: in this embodiment, the bridge 33a in this embodiment is connected perpendicularly to the front end of the barrel by a right angle flange 33 b. The melt adhesive screw driving assembly comprises a melt adhesive servo motor 33m and a melt adhesive speed reducer 33k which are in transmission connection, and the melt adhesive speed reducer is in transmission connection with a melt adhesive screw 33f through a melt adhesive transmission shaft 33 n. The glue melting component moving assembly comprises a glue melting guide rail pair 33r, the glue melting guide rail pair 33r is arranged on the glue melting support 33s, and the glue melting bearing seat 33j and the charging barrel seat 33h are both in sliding connection with the glue melting guide rail pair 33 r. The glue melting part 33 slides along the guide rail pair 33r by being driven by the injection part 32, thereby achieving the synchronous movement with the injection part 32. This melten gel part 33 is still including the melten gel bearing frame 33j and the feed cylinder seat 33h of dismantling the connection, and on the tail end of feed cylinder 33e was fixed in feed cylinder seat 33h, the tail end of melten gel screw rod 33f was connected with the bearing through flange 33i, this bearing and melten gel bearing frame 33j rotatable coupling, melten gel screw rod drive assembly set up on melten gel bearing frame 33j to be connected with melten gel screw rod 33f transmission. The melt adhesive part 33 further includes a melt adhesive screw moving cylinder 33p, and a cylinder body and a cylinder rod of the melt adhesive screw moving cylinder 33p are connected to a melt adhesive bearing block 33j and a cartridge holder 33h, respectively. The melt adhesive screw rod moving cylinder 33p can axially move the melt adhesive screw rod 33f, and the melt adhesive screw rod 33f is assisted to work when the machine is stopped to clean residual adhesive and disassemble and assemble the melt adhesive screw rod 33 f. The melting part 33 further includes a plurality of melting thermocouples 33c for measuring the temperature of the cartridge 33 e. The heating barrel 33g is matched with the melt glue thermocouple 33c under the control of the melt glue temperature control box 33d, so that the temperature of the charging barrel is accurately controlled, plastic particles are preheated, and heat is preserved.

When the melting component 33 melts, the heating barrel 33g preheats the charging barrel 33e, the right-angle flange 33b and the bridge 33a to a specified temperature, the melting screw driving component drives the melting screw 33f to rotate, so that the solid plastic continuously enters the charging barrel 33e from the feeding port, and the solid plastic is heated, extruded, sheared, plasticized and melted into a melt. The melt is extruded through the right-angled flanges 33b, the bridges 33a into the injection part 32. In the present embodiment, by separating the melting glue part 33 from the conventional melting glue injection part and connecting it with the other injection part 32 through the bridge 33a, it is actually preferable to arrange the melting glue part 33 on one side of the injection part 32, that is, to arrange them side by side and move them synchronously; the glue melting action is independent of other actions such as injection, mold closing and the like, so that the glue can be synchronously melted in other actions, the glue is prevented from occupying cycle time, and the efficiency is improved.

The injection molding process of the injection molding machine in the embodiment includes the following steps:

s1: the front molds 21 on the N mold closing units 3 are respectively closed with the N rear molds 21 of the corresponding rear mold group under the driving of the transmission device 31, and the molten plastic injection part melts the plastic and injects the plastic into the mold cavity through the front molds 22 to perform injection molding of a workpiece;

s2: opening the mold;

s3: the rotary die table 1 rotates to exchange the positions of the two rear die sets;

s4: taking out the product;

s5: steps S1 to S4 are executed in a loop.

In this embodiment, it is preferable that step S4 and step S1 are performed simultaneously. Step 4 of this embodiment preferably further comprises the step of inserting an insert into the rear mold 21 after removing the article.

Specifically, the opening action of a molten gel/injection/jet nozzle valve can be realized in a mold closing state; the ejection/blowing/vacuum/finished product taking action can be carried out in the injection state; the die opening state can have the closing actions of a rotary die, a molten gel, a vacuum insert and an injection nozzle valve. The two sets of inserts are placed in the two sets of rear molds, the two sets of front molds are used for continuously injecting the inserts. Only 4.0s is needed for one cycle. The conventional injection molding machine mainly comprises a frame 6, a conventional injection unit 7, a conventional single-set mold 8, a conventional mold closing unit (a conventional hinge type mold closing unit 9 or a conventional direct-pressure type mold closing unit 10), a controller 4 and a safety shield plate 5, and the structure of the conventional injection molding machine is shown in fig. 1-2. The injection molding process of this embodiment provides a significant time savings over the conventional injection molding process flow (which requires 9.0 seconds, as shown in fig. 3).

In a word, the invention can realize that a plurality of sets of moulds are arranged on one machine, and the plurality of sets of moulds work synchronously and alternatively, thereby avoiding the problem that one set of moulds of the conventional injection molding machine can not carry out injection pressure-maintaining cooling when taking products and loading inserts, improving the utilization rate of the moulds, particularly the front mould of the hot runner mould, improving the stability of the machine and the space utilization rate of a factory, and reducing the labor. The injection molding process can be synchronously and alternately carried out by multiple molds and multiple actions, realizes the flow which cannot be realized by the conventional injection molding machine, and achieves higher working efficiency.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. An injection molding machine, comprising:

a machine frame (6),

a rotary die table (1) which is rotatably arranged on the frame (6), two rear die sets are arranged along the circumferential direction of the rotary die table, each rear die set is provided with N rear dies (21),

the mould clamping device comprises N mould clamping units (3), wherein each mould clamping unit (3) comprises a transmission device (31) arranged on a rack (6) and a molten glue injection part matched with the transmission device, a front mould (22) is arranged on the transmission device (31), a rotary mould table (1) rotates, the front moulds (22) on the N mould clamping units (3) are alternatively clamped with N rear moulds (21) of two rear mould groups under the driving of the transmission device (31), and the molten glue injection part is used for melting plastics and injecting the plastics into a mould cavity through the front moulds (21) after mould clamping;

and N is an integer not less than 1.

2. An injection molding machine according to claim 1, wherein N is an integer not less than 2, and the back molds (21) of the two back mold units are alternately arranged in the circumferential direction of the rotation direction of the rotary mold table (1) and are uniformly distributed.

3. An injection moulding machine as claimed in claim 2, characterized in that N is 2, the two rear moulds (21) of each rear mould set being arranged symmetrically, and the two clamping units (3) being arranged symmetrically with respect to the turret (1).

4. An injection moulding machine as claimed in claim 3, characterized in that said transfer table (1) has a hexahedron (1f) with a square cross section, said hexahedron (1f) being rotated around a line connecting the centers of the upper and lower faces thereof, the rear moulds (21) of the two rear mould sets being respectively connected to two sets of opposite sides of said hexahedron (1 f).

5. An injection-molding machine as claimed in claim 1, characterized in that said mold table (1) is provided with 2N ejector devices (11) respectively associated with each rear mold.

6. An injection molding machine as claimed in claim 1, wherein the melt injection member comprises a melt part (33) and an injection part (33), the injection part being embedded in the transmission (31), the melt part (33) being disposed on one side of the transmission, being coupled to the injection part (33) by a bridge (33a), and being followed by the injection part (33).

7. An injection molding process of an injection molding machine according to any one of claims 1 to 6, comprising the steps of:

s1: the front molds (21) on the N mold closing units (3) are respectively closed with the N rear molds (21) of the corresponding rear mold units under the drive of the transmission device (31), and the molten glue injection part melts the plastic and injects the plastic into the mold cavity through the front molds (22) to perform injection molding of a workpiece;

s2: opening the mold;

s3: the rotary die table (1) rotates to exchange the positions of the two rear die sets;

s4: taking out the product;

s5: steps S1 to S4 are executed in a loop.

8. The injection molding process of the injection molding machine according to claim 7, wherein step S4 and step S1 are performed simultaneously.

9. The injection molding process of the injection molding machine according to claim 7 or 8, wherein the step (4) further comprises the step of fitting an insert on the rear mold (21) after the article is removed.