A rotary die table for injection molding machine

Abstract

The present invention relates to a rotary die table for an injection molding machine, comprising a rotatable polyhedron, having 2N side elevations uniformly distributed along the rotation direction, for fixing two rear die sets, each of the rear die sets having N rear die sets, and the N rear die sets of the two rear die sets are used to alternately close the mold with the N front die sets during the rotation of the polyhedron; N is an integer not less than 1. Compared with the prior art, the present invention places the rear die on the side elevation of the polyhedron of the rotary die table, and by rotating, the rear die sets of the two rear die sets are alternately closed with the front die sets; the rotary die table rotates after injection molding, and the rear die set that has completed injection molding is rotated out of the closing mold area, and the finished product is ejected; while the mold is rotated out to eject the finished product, another rear die set is transferred into the closing mold area for a synchronous injection process; the injection molding efficiency can be greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to a rotary mold table for an injection molding machine. Background Art

[0002] Inserting an insert into an injection molded product is a commonly used injection molding process. Figures 1 to 3 The conventional injection molding machine structure and the working cycle mode of insert products are described. The conventional injection molding machine mainly includes a frame, a conventional injection unit, a conventional single mold (a mold is generally composed of two halves, one half has an injection gate, here called the "front mold"; the other half has no gate, here called the "rear mold"), a conventional clamping unit, a controller and a safety shield. The conventional clamping unit is divided into a conventional hinge clamping unit or a conventional direct pressure clamping unit according to the different transmission devices (such as Figure 1 and Figure 2 As shown in the figure, a set of molds is installed in the front of the clamping unit, equipped with a robot (or manual insertion of inserts and removal of products), an ejection device is installed in the middle, and a gear mold adjustment device is installed at the rear.

[0003] Its specific structure: the mold clamping unit is mainly composed of a fixed plate, a movable plate, a tail plate, a tie rod, a transmission device (machine hinge type or direct pressure type), an ejector device and a mold adjustment device; the mold adjustment device is gear-driven, the small gear of the driving motor drives the large gear ring, and the large gear ring drives the mold adjustment nuts on the four tie rods to rotate and adjust the mold clamping position. The injection unit is mainly composed of a screw barrel assembly, a motor transmission assembly and an injection transmission assembly ( Figure 1 and Figure 2 ).

[0004] Its working process: at the beginning, the clamping unit closes the mold to form a mold cavity for the product; then the ejector seat moves forward and the ejector nozzle presses against the mold gate sleeve, and the plasticizing unit injects the molten resin into the mold cavity, and then maintains a certain pressure during the cooling and shrinking period of the mold cavity product to cool and solidify the resin to form a dense product; during the resin cooling process, the plasticizing unit starts to measure the plastic storage material to produce a certain amount of qualified quality melt to prepare for the next injection; after cooling, the ejector seat moves backward, the clamping unit opens the mold; the ejector mechanism ejects the product; the robot installs the insert, and a production cycle is completed (such as Figure 3 ); then close the mold to carry out the next working cycle.

[0005] The working cycle and structure of conventional injection molding machines have the following four disadvantages when producing insert products:

[0006] First, conventional injection molding machines can only be equipped with one set of molds.

[0007] Secondly, the machine operates sequentially, that is, one action is completed before the next action is carried out, and the molding speed is slow, which cannot meet the requirements of large-scale rapid production.

[0008] Third, during the external operation, the process of taking out the product and inserting the insert, the injection molding machine is in a waiting state, which also reduces the work efficiency.

[0009] Fourth, for packaging products, expensive group-cavity hot runner molds are usually used for rapid production, but the time it takes for the robot to pick up parts occupies a large part of the machine cycle, so the utilization rate of the hot runner mold is low. Summary of the invention

[0010] One object of the present invention is to provide an injection molding machine, which can realize the installation of multiple sets of molds on one machine, and the multiple sets of molds can work both synchronously and alternately, thereby avoiding the problem that a set of molds in a conventional injection molding machine cannot be injected, pressurized and cooled when taking out products and loading inserts, and improving the utilization rate of the front mold (usually a hot runner installation mold); further, the injection component is embedded in the clamping unit, thereby improving the space utilization rate.

[0011] Another object of the present invention is to provide an injection molding process that can be performed synchronously and alternately with multiple molds and multiple actions, thereby achieving a process that cannot be achieved by a conventional injection molding machine and achieving higher work efficiency.

[0012] A third object of the present invention is to provide a variety of innovative injection molding machine component structures to ensure stable and reliable operation of the machine.

[0013] The present invention provides an injection molding machine, comprising:

[0014] frame,

[0015] The rotary die table is rotatably arranged on the frame, and two rear die sets are arranged along the circumference of the rotary die table's rotation direction, and each rear die set has N rear dies.

[0016] N clamping units, each of which includes a transmission device arranged on a frame and a melt injection component matched with the transmission device, the transmission device is provided with a front mold, and during the rotation of the rotary mold table, the front molds on the N clamping units are driven by the transmission device to alternately clamp with the N rear molds of the two rear mold groups, and the melt injection component is used to melt the plastic after clamping and inject it into the mold cavity through the front mold;

[0017] The N is an integer not less than 1.

[0018] Preferably, N is an integer not less than 2, and the rear molds of the two rear mold groups are alternately arranged along the circumference of the rotation direction of the rotary mold table and are evenly distributed.

[0019] Preferably, N is 2, the two rear molds of each rear mold group are symmetrically arranged, and the two clamping units are symmetrically arranged relative to the rotary mold platform.

[0020] Preferably, the rotary die table has a hexahedron with a square cross section, the hexahedron rotates around a straight line connecting the centers of its upper and lower surfaces, and the rear molds of the two rear mold groups are respectively connected to two sets of opposite side surfaces of the hexahedron.

[0021] Preferably, the rotary die table is provided with 2N ejection devices respectively matched with each rear die.

[0022] Preferably, the melt injection component comprises a melt component and an injection component, the injection component is embedded in the transmission device, the melt component is arranged on one side of the transmission device, connected to the injection component through a bridge, and moves with the injection component.

[0023] The present invention also provides an injection molding process of an injection molding machine, comprising the following steps:

[0024] S1: The front molds on the N clamping units are driven by the transmission device to clamp the N rear molds of the corresponding rear mold group respectively, and the melt injection component melts the plastic and injects it into the mold cavity through the front mold to perform injection molding of the part;

[0025] S2: mold opening;

[0026] S3: The mold transfer table rotates to swap the positions of the two rear mold assemblies;

[0027] S4: Take out the product;

[0028] S5: Execute steps S1 to S4 in a loop.

[0029] Preferably, step S4 and step S1 are performed simultaneously.

[0030] Preferably, step (4) further comprises the step of inserting an insert into the rear mold after taking out the product.

[0031] The present invention sets a rotary mold table, and the rear mold matched with the front mold changes every time it rotates, so that the rear molds of the two rear mold groups are alternately molded with the front molds (for example, when N=2, the front molds on the two front mold units move toward each other from both sides of the machine, and are molded with the two "cold half molds" of the corresponding rear mold group on the rotary mold table), and the rear molds work in turn. When the rear mold of one rear mold group cooperates with the front mold for injection molding, the other rear mold group takes out the parts, and the taking out and the injection are synchronized. Thus, an alternating and synchronous working mode is creatively realized (preferably when N=2, the four molds work in pairs in an alternating and synchronous working mode), which not only improves the machine efficiency and output, but also improves the utilization rate of the front mold.

[0032] When N is an integer not less than 1, multiple rear molds of each rear mold group can be closed simultaneously, which can greatly improve the injection efficiency. For example, when N=2, the working efficiency can be doubled compared with the traditional injection molding machine.

[0033] In the present invention, the transfer mold platform is in the middle, and the mold clamping units are arranged around it (when N=2, the mold clamping units are symmetrically arranged on both sides of the transfer mold platform), so the factory space utilization rate is high.

[0034] The present invention also provides a rotary die table for an injection molding machine, comprising:

[0035] The polyhedron is rotatably arranged and has 2N side elevations evenly distributed in the circumferential direction along the rotation direction, and is used to fix two rear mold groups, each of which has N rear molds, and the N rear molds of the two rear mold groups are used to alternately close the molds with the N front molds during the rotation of the polyhedron;

[0036] The N is an integer not less than 1.

[0037] As a preferred technical solution, N is an integer not less than 2, and the rear molds of the two rear mold groups are alternately arranged along the circumference of the rotation direction of the rotary mold table and are evenly distributed.

[0038] As a preferred technical solution, N=2, the polyhedron is a hexahedron with four side elevations, and the two rear molds of each rear mold group are symmetrically arranged on two opposite side elevations;

[0039] The rotary die table also includes:

[0040] The frame support is surrounded by the hexahedron and fixed.

[0041] Heavy-duty slewing assembly for the rotational connection between hexahedron and frame support.

[0042] The embedded unloading kit is composed of a groove flange, a flange flange and a suspension rod mechanism for connecting the groove flange and the flange flange. The groove flange is fixed on a frame support and has a groove whose length direction is parallel to the straight line direction where the two front molds are located. The flange flange is engaged with the groove flange and can move relative to the groove flange along the length direction of the groove.

[0043] The rotary die table rotating assembly is fixed on the flange and is transmission-connected to the heavy-load rotary assembly through the flange.

[0044] The present invention engages the groove flange with the flange flange, thereby limiting the freedom of the power component and bearing the rotational torque of the power component, but allowing the power component to be displaced a small amount in the mold closing direction; when the hexahedron of the rotary mold table completes rotation and starts high-pressure mold closing, the hexahedron is subjected to a mold closing force of tens to hundreds of tons, and the transmission and fixing parts will be deformed, thereby causing the power component to be displaced a small amount in the mold closing direction. This kit allows such displacement by engaging the groove flange and the flange flange, thereby preventing the precision transmission parts from being subjected to additional stress from mold closing.

[0045] As a preferred technical solution, the frame support is composed of four columns surrounding the hexahedron and a rotary die base and a rotary die frame located at the bottom and top of the four columns respectively; the heavy-duty rotary assembly is used for the rotary connection between the hexahedron and the rotary die base and the rotary die frame of the frame support; the groove flange is fixed to the bottom of the rotary die base.

[0046] As a preferred technical solution, the heavy-duty rotary assembly includes an upper flange shaft connected to the top of the hexahedron and passing through the rotary die frame, an upper heavy-duty copper bushing arranged between the rotary die frame and the upper flange shaft, an upper flange cover arranged on the rotary die frame and matching 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 passing through the rotary die base, a lower heavy-duty copper bushing arranged between the rotary die base and the lower flange shaft, and a lower thrust bearing arranged between the groove flange and the lower flange shaft. During operation, the upper heavy-duty copper bushing and the lower heavy-duty copper bushing bear the heavy-duty clamping force.

[0047] As a preferred technical solution, the rotary die rotating assembly is composed of a rotary die servo motor, a rotary die reducer and a rotary die transmission shaft which are connected in a transmission manner, and the rotary die transmission shaft is connected to the heavy-duty rotary assembly.

[0048] As a preferred technical solution, the hexahedron is provided with four ejecting devices respectively matching with the four rear dies. The four ejecting devices all have an ejecting servo motor and an ejector rod which are arranged in a biased manner and connected in a transmission manner. The four ejecting devices are installed staggeredly, so that the four ejector rods are distributed in a "cross" shape and are respectively located at the centers of the four side elevations of the hexahedron. The ejecting servo motor is installed and driven in a biased manner relative to the ejector rod, so that the ejecting servo motor and the ejector rod are parallel but not coaxial, so that four groups of independent ejecting devices can be installed staggeredly in the narrow inner cavity of the hexahedron.

[0049] As a preferred technical solution, the ejecting servo motor of the ejecting device is connected to the screw part of the ejector ball screw through a coupling. The front and rear ends of the screw part are respectively passed through the front mounting plate and the rear mounting plate through the ejector screw bearings. An installation side plate is connected between the front mounting plate and the rear mounting plate and forms a "C" - shaped structure. A rolling guide rail parallel to the screw part is also arranged between the front mounting plate and the rear mounting plate. The nut part of the ejector ball screw is connected with an ejector plate passing through the rolling guide rail. The ejector rod passes through the front mounting plate, and the rear end of the ejector rod is fixed to the ejector plate.

[0050] The working principle of the rotary mold table of the present invention is as follows: the present invention places the rear mold on the side elevation of the polyhedron of the rotary mold table, and rotates the rear molds of the two rear mold groups to alternately close the mold with the front mold. The rotary mold table rotates after injection molding, and the rear mold group that has completed injection molding is rotated out of the closing mold area, and the finished product is ejected; while the mold is ejected out of the mold, the other rear mold group is transferred into the closing mold area for synchronous injection. The rotary mold table can greatly improve the efficiency of injection molding.

[0051] In particular, when the two rear mold groups of the present invention are composed of two symmetrically arranged rear molds, the two front molds are symmetrically arranged relative to the rotating mold table. When closing the mold, the two front molds move toward each other from both sides to close the mold with the rear molds on the two symmetrical side elevations. After injection molding, the rotating mold table rotates 90° to turn the rear mold group that has completed injection molding out of the closing mold area to eject the finished product; while the mold is turned out to eject the finished product, the two rear molds of the other rear mold group are turned into the closing mold area for synchronous injection. Not only is the injection molding efficiency high, but the force during closing the mold is more reasonable, the layout is more scientific, and the space occupied by the equipment can be greatly reduced.

[0052] The present invention also provides a transmission device for a mold clamping unit of an injection molding machine, the transmission device comprising a guide rail, a movable plate slidably connected to the guide rail, a tail plate fixed to the guide rail, a force-amplifying transmission assembly connected between the movable plate and the tail plate, and a driving assembly acting on the force-amplifying transmission assembly, wherein the movable plate is used to be connected to the front mold and has an inner cavity for embedding an injection component.

[0053] As a preferred technical solution, the force-amplifying transmission assembly adopts a crank-connecting rod mechanism, which is composed of a crank and a long connecting rod connected in a transmission manner. The free end of the crank is connected to the tail plate, and the free end of the long connecting rod is connected to the movable plate. The driving assembly acts on the crank.

[0054] As a preferred technical solution, the driving assembly includes:

[0055] The middle plate is set on the guide rail and located between the moving plate and the tail plate.

[0056] The transmission ball screw has a screw portion which is passed through the tail plate and the middle plate through a bearing, and a nut seat is provided on the nut portion, and the nut seat is connected with a short connecting rod, and acts on the force-increasing transmission component through the short connecting rod.

[0057] The driver is connected with the screw part in driving connection and is used for driving the screw part to rotate.

[0058] As a preferred technical solution, the force-increasing transmission assembly is provided with two, symmetrically arranged on both sides of the transmission ball screw. The nut seat adopts a cross-shaped nut seat, having two wings symmetrical with respect to the transmission ball screw, and both wings of the cross-shaped nut seat are connected with short connecting rods, and act on the two force-increasing transmission assemblies through the short connecting rods.

[0059] As a preferred technical solution, the transmission ball screw adopts a heavy-loaded large steel ball screw.

[0060] As a preferred technical solution, the driver includes a mold closing servo motor fixed on the tail plate, a driving synchronous pulley arranged on the output shaft of the mold closing servo motor, a driven synchronous pulley arranged on the screw part, and a synchronous belt for connecting the driving synchronous pulley and the driven synchronous pulley.

[0061] As a preferred technical solution, the tail end of the screw portion passes through the tail plate and is located behind the tail plate, the driven synchronous pulley is arranged at the tail end of the screw portion, the mold closing servo motor is arranged on the side of the tail plate, the output shaft faces the rear of the tail plate, and the synchronous belt is located behind the tail plate.

[0062] As a preferred technical solution, the screw rod is respectively passed through the tail plate and the middle plate via a positioning bearing and a radial thrust bearing.

[0063] As a preferred technical solution, the guide rail is composed of four pull rods distributed in a rectangular shape and passing through the four corners of the moving plate, the tail plate and the middle plate.

[0064] The tail plate and the moving plate of the transmission device are used for mold clamping and force amplification through a force-increasing transmission component, preferably a crank-connecting rod mechanism. The mold clamping servo motor drives the transmission ball screw to rotate through a belt drive, pushing the cross nut seat forward or backward, and then pulling the crank-connecting rod mechanism, so that the moving plate can perform mold clamping and mold opening actions at high speed and smoothly. The combination of the locating bearing and the radial thrust bearing forms a high-rigidity support for the ball screw, which can allow the ball screw to rotate at high speed. The injection mold is arranged at the same end, which greatly improves the utilization efficiency of the factory space.

[0065] The present invention also provides a nozzle for injecting a component of an injection molding machine, comprising:

[0066] The nozzle body has a fluid channel inside.

[0067] The injection screw is inserted at the rear of the fluid channel and can move axially.

[0068] The bridge connection hole is connected to the fluid channel in front of the injection screw, and is used to connect the bridge and receive the melt through the melt channel set inside the bridge.

[0069] The nozzle switch is used to switch the connection between the fluid channels before and after the bridge connection hole and the connection between the fluid channel behind the bridge connection hole and the bridged melt channel.

[0070] As a preferred technical solution, the nozzle switch includes 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 connection between the fluid channel and the bridging connecting hole. The rotary valve core is provided with a three-way hole for switching the connection between the fluid channels before and after the bridging connecting hole and the connection between the fluid channel behind the bridging connecting hole and the bridged melt channel.

[0071] As a preferred technical solution, the three-way hole is T-shaped, and the valve core drive assembly is used to drive the rotating valve core to perform 90° reciprocating swing.

[0072] As the preferred technical solution:

[0073] When the front and rear fluid passages of the bridge connection hole are connected, two through holes arranged opposite to each other in the three through holes connect the front and rear fluid passages of the bridge connection hole, and the other through hole faces away from the bridge connection hole;

[0074] When the fluid channel behind the bridging connection hole is connected with the bridged melt channel, two mutually perpendicular through holes in the three through holes connect the fluid channel behind the bridging connection hole with the bridged melt channel, and the other through hole faces away from the bridging connection hole.

[0075] As a preferred technical solution, the rotary valve core is provided with multiple damping grooves, and a material collection channel is provided in the rotary valve core. The inlet end of the material collection channel is connected to the damping groove through a small hole provided in a damping groove, and the outlet end leads to the end of the rotary valve core.

[0076] As a preferred technical solution, the rotary valve core is vertically arranged, the bottom end of the rotary valve core passes through the nozzle body and is located below the nozzle body, and the outlet end of the material collection channel leads to the bottom end of the rotary valve core, so as to facilitate the discharge of gap residual materials.

[0077] As a preferred technical solution, the valve core drive assembly includes a crank connecting rod mechanism and a nozzle switch cylinder which are sequentially connected to the rotating valve core.

[0078] As a preferred technical solution, the fluid channel is composed of a nozzle cavity and an injection cavity connected in front and back, a bridging connection hole is provided at the connection between the nozzle cavity and the injection cavity, and the shape of the injection cavity matches the injection screw.

[0079] As a preferred technical solution, the portion of the injection screw extending into the fluid channel is provided with a plurality of unloading grooves, which can effectively limit the leakage of the molten glue under high pressure and are highly pressure-resistant.

[0080] As a preferred technical solution, the injection screw is a pointed cylindrical structure, and the unloading groove is arranged on the cylindrical part of the injection screw.

[0081] As a preferred technical solution, the injection screw is provided with a discharge channel, the inlet end of the discharge channel is connected to the discharge groove through a small hole provided in the discharge groove, and the outlet end is located at the rear of the injection screw. The discharge channel is provided to discharge the leaked molten glue in a directional manner. The molten glue at the end of the injection screw is renewed by leakage, which effectively avoids the problem of long-term retention of the screw head pad and degradation and contamination of the product.

[0082] As a preferred technical solution, a grooved shaft neck is provided at the rear end of the injection screw, and the grooved shaft neck is used to connect with a component that drives the injection screw to achieve a loosening function.

[0083] As a preferred technical solution, the nozzle body is composed of a nozzle flange and a nozzle part connected to the front end of the nozzle flange, and the connection between the fluid channel and the bridging connection hole is located on the nozzle flange.

[0084] As a preferred technical solution, the nozzle is coated with a heater.

[0085] The present invention also provides an injection component for an injection molding machine, comprising: an injection unit, a nozzle connected to one end of the injection unit, and a shot moving unit for driving the injection component to move;

[0086] The injection unit is composed of a box body, a ball screw transmission assembly arranged in the box body, and a servo motor assembly for driving the ball screw transmission assembly to move.

[0087] The nozzle is connected to the front end of the injection unit, and the ball screw transmission assembly is connected to the injection screw through the injection force sensor and drives the injection screw to reciprocate.

[0088] As a preferred technical solution, the ball screw transmission assembly includes:

[0089] Injection ball screw,

[0090] The injection drive shaft is a hollow structure, which is sleeved outside the nut of the injection ball screw, rotatably connected to the box body, and used for transmission connection with the servo motor assembly.

[0091] The guide plate is connected to the front end of the screw portion of the injection ball screw and is slidably connected to the box body through the injection guide rail, and is used to drive the injection screw to reciprocate.

[0092] As a preferred technical solution, the rear end of the injection screw is connected to a screw connecting seat, and the injection force sensor is arranged between the guide plate and the screw connecting seat.

[0093] As a preferred technical solution, the center of the guide plate is connected to the screw portion of the injection ball screw, and the injection guide rail is composed of two slide rails symmetrically arranged relative to the screw portion of the injection ball screw.

[0094] As a preferred technical solution, the injection transmission shaft is rotatably connected to the housing through a radial thrust bearing and a load-relief bearing sleeved on the front and rear of the injection transmission shaft.

[0095] As a preferred technical solution, the rear end of the injection drive shaft extends backward and out of the box body for transmission connection with the servo motor assembly.

[0096] As a preferred technical solution, the servo motor assembly includes an injection servo motor fixedly arranged relative to the housing and an injection timing belt assembly for drivingly connecting the output shaft of the injection servo motor and the injection drive shaft.

[0097] As a preferred technical solution, the injection synchronous belt assembly includes an injection large synchronous pulley sleeved on the rear end of the injection transmission shaft, an injection active synchronous pulley connected to the output shaft of the injection servo motor, and an injection synchronous belt for connecting the injection large synchronous pulley and the injection active synchronous pulley.

[0098] As a preferred technical solution, the injection servo motor is fixed to one side of the outside of the box through an injection motor seat.

[0099] As a preferred technical solution, the transfer unit includes:

[0100] The slide plate of the shooting base is set on the box body.

[0101] The guide rail pair of the shooting and moving base is used for the sliding of the shooting and moving base slide.

[0102] The tension cylinder is used to connect the box and the moving plate of the injection molding machine so that the nozzle is close to the front mold during injection.

[0103] Working process of injection components: the tension cylinder moves the entire injection component, so that the nozzle is pressed against the mold injection gate or detached. When the machine controller sends a signal for injection, the nozzle switch cylinder drives the rotary valve core to rotate 90 degrees, so that the nozzle is connected to the injection cavity; the injection servo motor rotates, and drives the injection ball screw through the belt drive - generally a heavy-duty large steel ball ball screw rotates, and the guide plate pushes the injection screw forward along the injection guide rail through the injection force sensor to inject and maintain pressure. The injection force is controlled in a closed loop by the controller of the injection servo motor and the injection force sensor. After the injection is completed, the nozzle switch cylinder drives the rotary valve core to rotate 90 degrees, and the injection cavity is connected to the melt component, and the melt from the melt component pushes the injection screw back. Under the closed-loop control of the force sensor, the resistance to the injection screw retreat during melting, that is, the back pressure, can be accurately controlled.

[0104] The injection parts are coaxially installed as a whole, without the external parts that move linearly with the screw like conventional shooting platforms; the injection pressure and the pressure of the glue during the melt storage (i.e. back pressure) are closed-loop controlled through force sensors and servo control systems; the rotary valve core is placed vertically to facilitate the discharge of residual material in the gap.

[0105] The present invention also provides a melt-melting component for an injection molding machine, comprising:

[0106] The barrel has a feeding port and is wrapped with a heating tube on the outside.

[0107] The bridge is vertically connected to the front end of the barrel and communicates with the barrel. It is used to connect with the injection component to provide molten glue, and the outside of the bridge is wrapped with a heating tube.

[0108] The melt screw is inserted into the barrel.

[0109] The melt screw drive assembly is used to drive the melt screw to rotate.

[0110] The melt-molding component moving component is used for following the melt-molding component and the injection component.

[0111] As a preferred technical solution, the bridge is vertically connected to the front end of the barrel through a right-angle flange.

[0112] As a preferred technical solution, the melt glue component also includes a detachably connected melt glue bearing seat and a barrel seat, the tail end of the barrel is fixed on the barrel seat, the tail end of the melt glue screw is connected to a bearing through a connecting flange, the bearing is rotatably connected to the melt glue bearing seat, and the melt glue screw drive assembly is arranged on the melt glue bearing seat and is drivingly connected to the melt glue screw.

[0113] As a preferred technical solution, the glue melt screw driving assembly includes a glue melt servo motor and a glue melt reducer which are transmission-connected, and the glue melt reducer is transmission-connected to the glue melt screw via a glue melt transmission shaft.

[0114] As a preferred technical solution, the melt adhesive component moving assembly includes a melt adhesive support and a melt adhesive guide rail pair arranged on the melt adhesive support, and the melt adhesive bearing seat and the barrel seat are both slidably connected to the melt adhesive guide rail pair. The melt adhesive component slides along the guide rail pair under the drive of the injection component, thereby realizing synchronous movement with the injection component.

[0115] As a preferred technical solution, the melt glue component also includes a melt glue screw moving cylinder, the cylinder body and cylinder rod of which are respectively connected to the melt glue bearing seat and the barrel seat. The melt glue screw moving cylinder can axially move the melt glue screw to assist in cleaning residual glue and disassembling the melt glue screw when the machine is shut down.

[0116] As a preferred technical solution, the melt glue component also includes a plurality of melt glue thermocouples for measuring the temperature of the barrel. The heating barrel and the melt glue thermocouple cooperate to accurately control the temperature of the barrel, preheat the plastic particles and keep them warm.

[0117] The working principle of the melt-melting component is as follows: When melting, the heating cylinder preheats the barrel, right-angle flange, and bridge to the specified temperature, and the melt-melting screw drive assembly drives the melt-melting screw to rotate, so that the solid plastic enters the barrel from the feed port continuously, and is heated, extruded, sheared, and plasticized and melted into a melt. The melt is squeezed into the injection component through the right-angle flange and bridge.

[0118] The present invention separates the melt-glue component from the conventional melt-glue injection component and connects it with another injection component through a bridge. In practice, it is preferred to arrange the melt-glue component on one side of the injection component, that is, the two are arranged side by side and move synchronously; the melt-glue action is independent of other actions such as injection and mold closing, so the melt-glue can be synchronized with other actions, avoiding the melt-glue occupying the cycle time and improving efficiency.

[0119] The present invention also provides a mold adjusting device for a mold adjusting unit of an injection molding machine. The mold adjusting device is arranged on a tail plate of the mold adjusting unit of the injection molding machine and is used to drive the mold adjusting unit to move relative to a guide rail composed of a plurality of pull rods. The mold adjusting device comprises a gear motor, a chain and a sprocket mold adjusting nut screwed on the tail end of each pull rod respectively. The gear motor drives the sprocket mold adjusting nuts on each pull rod to rotate synchronously via the chain. The device also comprises a clamping plate. The clamping plate and the tail plate are separated on both sides of the sprocket mold adjusting nut. At least two sprocket mold adjusting nuts form a group and share a clamping plate. A fixed distance fixing rod is connected between the clamping plate and the tail plate.

[0120] As a preferred technical solution, a front flat plate thrust bearing and a rear flat plate thrust bearing are respectively provided on the front and rear sides of the sprocket die-adjusting nut.

[0121] As a preferred technical solution, the gear motor is arranged on the tail plate through a motor base, and drives the chain to move through a driving small sprocket. The motor base can rotate around the driving small sprocket, and a driven small sprocket is also provided on the motor base. The driven small sprocket is eccentrically arranged on the motor base relative to the driving small sprocket.

[0122] As a preferred technical solution, each sprocket mold adjustment nut is located on the inner side of the chain, and the driven small sprocket and the driving small sprocket are located on the inner and outer sides of the chain.

[0123] As a preferred technical solution, the tail plate is further provided with an idler wheel, which is located outside the chain and is used to cooperate with the driven small sprocket and the driving small sprocket to tighten the chain.

[0124] As a preferred technical solution, the guide rail is composed of four pull rods distributed in a rectangular shape, and the sprocket-shaped mold-adjusting nuts on two adjacent pull rods are a group and share a clamping plate.

[0125] As a preferred technical solution, the mold adjustment device also includes two travel switches located on one side of the tail plate and arranged along the length direction of the pull rod, and a pressure rod connected to the tail plate and located between the two travel switches. The travel switch cooperates with the pressure rod to limit the mold adjustment stroke.

[0126] The mold adjustment device is installed on the tail plate and is used to move the entire mold clamping unit when replacing molds of different thicknesses so that the mold can be clamped just right and the appropriate clamping force can be achieved. Its working principle is as follows:

[0127] The gear motor drives the active small sprocket to rotate and drags the chain to rotate the four sprocket mold adjustment nuts. The sprocket mold adjustment nut is screwed together with the pull rod and clamped between the clamping plate and the tail plate. The fixed distance fixing rod determines the distance between the clamping plate and the tail plate to ensure a reasonable gap (generally 0.1mm) between the sprocket mold adjustment nut and the clamping plate and the tail plate, and can rotate freely relative to the tail plate at a fixed distance. Therefore, the rotation of the sprocket mold adjustment nut causes the tail plate to move along the pull rod, changing the clamping position of the moving plate to achieve the purpose of adjusting the mold thickness. The driven small sprocket is installed on the mold adjustment motor seat for chain tensioning. The tensioning method is: rotate the mold adjustment motor seat with the active small sprocket as the center, so that the driven small sprocket deflects and presses the chain to achieve the purpose of tensioning. Every two sprocket mold adjustment nuts share a clamping plate, which is not easy to get stuck during the mold adjustment process. The entire mold adjustment device is simple, efficient and stable.

[0128] Compared with the prior art, the present invention can realize the installation of multiple sets of molds on one machine, and the multiple sets of molds can work synchronously and alternately, avoiding the problem that a set of molds of a conventional injection molding machine cannot be injected, pressurized and cooled when taking out products and inserting inserts, and also realizes the improvement of the utilization rate of molds, especially the front mold of hot runner molds, improving machine stability, factory space utilization, and reducing labor. The injection molding process of the present invention can be carried out synchronously and alternately with multiple molds and multiple actions, realizing a process that cannot be achieved by conventional injection molding machines, and achieving higher work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0129] Figure 1 It is a schematic diagram of the structure of a conventional hinged type injection molding machine;

[0130] Figure 2 It is a schematic diagram of the structure of a conventional direct pressure type combined injection molding machine;

[0131] Figure 3 This is the working mode and action sequence diagram of a conventional injection molding machine. The horizontal axis is time and the vertical axis is machine action.

[0132] Figure 4 It is a structural schematic diagram of the injection molding machine of the present invention;

[0133] Figure 5 This is a working principle diagram of the injection molding machine in Example 1 of the present invention;

[0134] Figure 6 The working mode and action timing diagram of the injection molding machine of Example 1 of the present invention; the horizontal axis in the figure is time, and the vertical axis is the machine action;

[0135] Figure 7 Schematic diagram of the front view structure (a) and the schematic diagram of the top view structure (b) of the injection molding machine of Example 1 of the present invention;

[0136] Figure 8 Schematic diagram (a) of the structure of the rotary die table of Example 1 of the present invention and schematic diagram (b) of the DD cross-section in (a);

[0137] Fig. 9 Schematic diagram of a cross section of an ejection device according to Embodiment 1 of the present invention (a), schematic diagram of an elevation view of four ejection devices (b), schematic diagram of a side view of four ejection devices (c), and schematic diagram of a top view of four ejection devices (d);

[0138] Fig.10 Schematic diagram (a) of the structure of the mold clamping unit of Example 1 of the present invention and schematic diagram (b) of the EE cross-section in (a);

[0139] Fig.11 Schematic diagram (a) of the transmission device of the clamping unit of Example 1 of the present invention and a schematic diagram of the structure of the DD section in (a);

[0140] Fig.12 Schematic diagram (a) of the structure of the injection component of Example 1 of the present invention and the schematic diagram of the structure of the DD section in (a);

[0141] Fig.13 This is a schematic diagram of the structure of the nozzle of Example 1 of the present invention;

[0142] Fig.14 This is a schematic structural diagram of an injection screw according to Example 1 of the present invention;

[0143] Fig.15 Schematic diagram (a) of the structure of the melt adhesive component of Example 1 of the present invention and the schematic diagram of the structure of the DD section in (a);

[0144] Fig.16 Schematic diagram of the front structure (a) and schematic diagram of the side structure (b) of the mold adjustment device of Example 1 of the present invention.

[0145] In the figure, 1 is a rotary mold table, 21 is a rear mold, 22 is a front mold, 3 is a clamping unit, 4 is a controller, 5 is a safety shield plate, 6 is a frame, 7 is a conventional injection unit, 8 is a conventional single-set mold, 9 is a conventional hinged clamping unit, 10 is a conventional direct pressure clamping unit, 11 is an ejector 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 mold stand, 1h is a lower flange shaft, 1i is a lower thrust bearing, 1j is a rotary mold transmission shaft, 1k is a rotary mold reducer, 1m is a rotary mold servo motor, 1n is a rotary mold base, 1p is a lower heavy-load copper sleeve, 1q is a groove flange, 1r is a flange flange, and 1s is a suspension rod. , 11a is the ejector servo motor, 11b is the coupling, 11c is the rear mounting plate, 11d is the ejector ball screw, 11e is the mounting side plate, 11f is the front mounting plate, 11g is the ejector screw bearing, 11h is the rolling guide, 11i is the ejector rod, 11j is the ejector plate, 31 is the transmission device, 32 is the injection component, 33 is the melt component, 34 is the mold adjustment device, 31a is the pull rod, 31b is the moving plate, 31c is the long connecting rod, 31d is the crank, 31e is the tail plate, 31f is the mold closing servo motor, 32f1 is the unloading groove, 31g is the active synchronous pulley, 31h is the synchronous belt, 31i is the positioning bearing, 31j is the connecting pin shaft, 31k is the short connecting rod, 31m is the cross nut seat, 31n is the transmission ball screw rod, 31p is the middle plate, 31q is the radial thrust bearing, 31u is the driven synchronous pulley, 32a is the nozzle part, 32b is the heater, 32c is the nozzle flange, 32d is the rotary valve core, 32d1 is the damping groove, 32e is the nozzle thermocouple, 32f is the injection screw, 32f1 is the unloading groove, 32f2 is the unloading channel, 32f3 is the drain hole, 32f4 is the grooved shaft neck, 32g is the box body, 32h is the injection force sensor, 32i is the guide plate, 32j is the radial thrust bearing, 32k is the injection transmission shaft, 32m is the unloading bearing seat, 32n is the unloading bearing, 32p is the injection ball screw, 32q is the injection large synchronous pulley, 32r is the injection synchronous belt, 32s is the injection motor seat, 32t is the injection servo motor, 32u is the guide pair of the shooting and shifting base, 32v is the slide of the shooting and shifting base, 32w is the tensioning cylinder, 32x is the nozzle switch cylinder, 32y is the injection guide rail, 32z is the screw connecting seat, 33a is the bridge, 33b is the right-angle flange, 33c is the melt thermocouple, 33d is the melt temperature control box, 33e is the barrel, 33f is the melt screw, 33g is the heating cylinder, 33h is the barrel seat, 33i is the connecting flange, 33j is the melt bearing seat, 33k is the melt reducer, 33m is the melt servo motor, 33n is the melt transmission shaft, 33p is the melt screw moving cylinder, 33r is the melt guide pair, 33s is the melt bracket, 34a is the active small sprocket, 34b is the driven small sprocket, 34c is the sprocket mold adjustment nut,34d is a fixed distance rod, 34e is a clamping plate, 34f is a chain, 34g is an idler wheel, 34h is a gear motor, 34i is a mold adjustment motor seat, 34j is a pressure rod, 34k is a switch seat, 34m is a travel switch, 34q is a front plate thrust bearing, and 34r is a rear plate thrust bearing. DETAILED DESCRIPTION

[0146] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0147] Example 1

[0148] An injection molding machine, such as Figures 4-5 As shown, it includes a frame 6, a rotary die table 1 and N clamping units 3, wherein: the rotary die table 1 is rotatably arranged on the frame 6, and two rear die sets are arranged along the circumference of the rotary die table's rotation direction, and each rear die set has N rear molds 21; each clamping unit 3 includes a transmission device 31 arranged on the frame 6 and a melt injection component matched with the transmission device, and a front mold 22 is arranged on the transmission device 31. During the rotation process of the rotary die table 1, the front molds 22 on the N clamping units 3 are alternately clamped with the N rear molds 21 of the two rear die sets under the drive of the transmission device 31, and the melt injection component is used to melt the plastic after clamping and inject it into the mold cavity through the front mold 21; the value of N is an integer not less than 1. It is further preferred that N is an integer not less than 2, and the rear molds 21 of the two rear die sets are alternately arranged along the circumference of the rotary die table 1's rotation direction and are evenly distributed. The rotary die table 1 is in the middle, and the clamping units 3 are arranged around it. By setting up the mold rotating table 1, the rear mold 21 that cooperates with the front mold 22 will change every time it rotates, so that the rear molds 21 of the two rear mold groups are alternately molded with the front mold 22, and the rear molds work in turn. When the rear mold of one rear mold group cooperates with the front mold for injection molding, the other rear mold group takes out the parts, and the taking out and injection are synchronized. In this way, the alternating and synchronous working mode is creatively realized, which not only improves the machine efficiency and output, but also increases the utilization rate of the front mold. The frame is also provided with a controller for controlling the action of the injection molding machine and a safety protection cover plate 5 covered on the equipment.

[0149] In this embodiment, N is selected as 2, and the two rear molds 21 of each rear mold group are symmetrically arranged, and the two clamping units 3 are symmetrically arranged relative to the rotary mold table 1. At this time, the front molds on the two front mold units can move toward each other from both sides of the machine and clamp with the two "cold half molds" of the corresponding rear mold group on the rotary mold table 1. The four rear molds 21 work in pairs in alternating and synchronous working mode. The overall structure is shown in FIG. Figure 7 .

[0150] In this embodiment, the structural diagram of the rotary die table 1 used for the injection molding machine is shown in Figure 8The rotary die table 1 includes: a hexahedron 1f, a frame support, a heavy-load rotary assembly, an embedded unloading kit 12 and a rotary die table rotating assembly, wherein: the hexahedron 1f can rotate around the straight line where the connecting line of the centers of its upper and lower surfaces is located, and has four side elevations, and the two rear molds 21 of each rear mold group are symmetrically arranged on two opposite side elevations, and the two front molds 22 are symmetrically arranged relative to the rotary die table; the frame support surrounds the outside of the hexahedron 1f and is fixedly arranged; the heavy-load rotary assembly is used for the rotational connection between the hexahedron 1f and the frame support; the embedded unloading kit 12 consists of a groove flange 1q, a flange flange 1r and a groove flange 1 for connecting the groove flange 1 The groove flange 1q is fixed on the frame support and has a groove whose length direction is parallel to the straight line direction of the two front molds 22. The flange flange 1r is engaged with the groove flange 1q and can move relative to the groove flange 1q along the length direction of the groove. The hanger mechanism is composed of multiple hangers 1s and nuts sleeved on each hanger 1s. The top of the hanger 1s is fixed on the groove flange 1q and is located on both sides of the flange flange 1r. The nuts are used to support the flange flange 1r; the rotary mold table rotating assembly is fixed on the flange flange 1r, and is connected to the heavy-load rotary assembly through the flange flange 1r. By fitting the groove flange 1q and the flange flange 1r, the freedom of the power component is limited and the rotation torque of the power component is borne, but the power component is allowed to move slightly in the straight line direction when the two clamping units 3 symmetrically arranged relative to the rotary mold table 1 move toward each other in the clamping direction; when the hexahedron 1f of the rotary mold table 1 completes its rotation and starts high-pressure clamping, the hexahedron is subjected to tens to hundreds of tons of clamping force, and the transmission and fixing parts will be deformed, so that the power component will be slightly displaced in the clamping direction. This kit allows such displacement by fitting the groove flange 1q and the flange flange 1r, thereby preventing the precision transmission parts from being subjected to additional clamping stress. More specifically: Figure 8As shown in Figures a to b, the frame support in this embodiment is composed of four columns 1a surrounding the hexahedron 1f, and a transfer die base 1n and a transfer die frame 1g located at the bottom and top of the four columns 1a respectively; the heavy-duty slewing assembly is used for the rotational connection between the hexahedron 1f and the transfer die base 1n and the transfer die frame 1g of the frame support; the groove flange 1q is fixed to the bottom of the transfer die base 1n. The heavy-duty slewing assembly includes an upper flange shaft 1e connected to the top of the hexahedron 1f and passing through the transfer die frame 1g, an upper heavy-duty copper bushing 1b arranged between the transfer die frame 1g and the upper flange shaft 1e, an upper flange cover 1c arranged on the transfer die frame 1g and matching 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 passing through the transfer die base 1n, a lower heavy-duty copper bushing 1p arranged between the transfer die base 1n and the lower flange shaft 1h, and a lower thrust bearing 1i arranged between the groove flange 1q and the lower flange shaft 1h. During operation, the upper heavy-duty copper bushing 1b and the lower heavy-duty copper bushing 1p bear the heavy-duty clamping force. The transfer die rotating assembly is composed of a transfer die servo motor 1m, a transfer die reducer 1k, and a transfer die drive shaft 1j that are drivingly connected, and the transfer die drive shaft 1j is connected to the heavy-duty slewing assembly. As Fig. 9 As shown in Figures a to d, the hexahedron 1f in this embodiment is also provided with four ejection devices 11 respectively matching with the four rear dies 21. The four ejection devices all have an ejection servo motor 11a and a thimble rod 11i that are offset and drivingly connected. The four ejection devices are staggeredly installed, so that the four thimble rods 11i are distributed in a "cross" shape and are respectively located at the centers of the four side elevations of the hexahedron 1f. The ejection servo motor 11a is offset and drivingly installed relative to the thimble rod 11i, so that the ejection servo motor 11a is parallel but not coaxial with the ejection rod 11i, so that four independent ejection devices 11 can be staggeredly installed in the narrow inner cavity of the hexahedron 1f. More specifically, the ejection servo motor 11a of the ejection device 11 is connected to the screw part of the thimble ball screw 11d through a coupling 11b. The front and rear ends of the screw part pass through the front mounting plate 11f and the rear mounting plate 11c through thimble screw bearings 11g respectively. An installation side plate 11e is connected between the front mounting plate 11f and the rear mounting plate 11c and forms a "C" - shaped structure. A rolling guide 11h parallel to the screw part is also arranged between the front mounting plate 11f and the rear mounting plate 11c. The nut part of the thimble ball screw 11d is connected to a thimble plate 11j passing through the rolling guide 11h. The thimble rod 11i passes through the front mounting plate 11f, and the rear end of the thimble rod 11i is fixed to the thimble plate 11j. The thimble servo motor 11a drives the thimble ball screw 11d, so that the thimble plate 11j moves back and forth along the rolling guide 11h, and the thimble rod 11i then completes the forward and backward ejection actions. The four groups of thimble devices 11 respectively eject and retract perpendicularly to the four side elevations of the hexahedron 1f.

[0151] This embodiment adopts the rotary mold table 1 and sets the two front molds 22 symmetrically relative to the rotary mold table 1. When closing the mold, the two front molds 22 move toward each other from both sides to close the mold with the rear molds 21 on the two symmetrical side elevations. After injection molding, the rotary mold table rotates 90° to turn the rear mold group that has completed injection molding out of the mold closing area to eject the finished product; while the mold is turned out to eject the finished product, the two rear molds of the other rear mold group are turned into the mold closing area for synchronous injection. Not only is the injection molding efficiency high, but the force during closing the mold is more reasonable, the layout is more scientific, and the space occupied by the equipment can be greatly reduced.

[0152] In this embodiment, the structure of the transmission device 31 used for the mold clamping unit 3 of the injection molding machine is shown in FIG. Fig.10 (a) to (b) and Fig.11(a) to (b), including 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, the moving plate 31b is used to connect with the front mold 22, and has an inner cavity for embedding the injection component 33. More specifically: the force-increasing transmission assembly adopts a crank-connecting rod mechanism, which is composed of a crank 31d and a long connecting rod 31c connected by a connecting pin 31j, the free end of the crank 31d is connected to the tail plate 31e, and the free end of the long connecting rod 31c is connected to the moving plate 31b, and the driving assembly acts on the crank 31d. The driving assembly includes a middle plate 31p, a transmission ball screw 31n and a driver; wherein the middle plate 31p is arranged on the guide rail and is located between the moving plate 31b and the tail plate 31e, and the transmission ball screw 31n preferably adopts a heavy-duty large steel ball ball screw, and its screw portion is respectively passed through the tail plate 31e and the middle plate 31p through a positioning bearing 31i and a radial thrust bearing 31q, and a nut seat is provided on the nut portion, and the nut seat is connected with a short connecting rod, and acts on the force-increasing transmission assembly through the short connecting rod 31k; the driver is connected to the screw portion for driving the screw portion to rotate. In this embodiment, there are two force-increasing transmission assemblies, which are symmetrically arranged on both sides of the transmission ball screw 31n. The nut seat adopts a cross-shaped nut seat 31m, which has two wings symmetrical to the transmission ball screw 31n, and the two wings of the cross-shaped nut seat 31m are both connected with a short connecting rod 31k, and act on the two force-increasing transmission assemblies through the short connecting rod 31k. The driver in this embodiment includes a mold closing servo motor 31f fixed on the tail plate 31e, a driving synchronous pulley 31g arranged on the output shaft of the mold closing servo motor 31f, a driven synchronous pulley 31u arranged on the screw part, and a synchronous belt 31h for connecting the driving synchronous pulley 31g and the driven synchronous pulley 31u. The tail end of the screw part of the transmission ball screw 31n in this embodiment passes through the tail plate 31e and is located behind the tail plate, the driven synchronous pulley 31u is arranged at the tail end of the screw part, the mold closing servo motor 31f is arranged on the side of the tail plate 31e, the output shaft faces the rear of the tail plate 31e, and the synchronous belt 31h is located behind the tail plate 31e. The guide rail in this embodiment is composed of four pull rods 31a distributed in a rectangular shape, and is penetrated at the four corners of the moving plate 31b, the tail plate 31e and the middle plate 31p.

[0153] The tail plate 31e and the moving plate 31b of the transmission device 31 of this embodiment are used for mold clamping and force amplification through a force-increasing transmission component, preferably a crank-connecting rod mechanism. The mold clamping servo motor 31f drives the transmission ball screw 31n to rotate through a belt drive, pushing the cross nut seat 31m forward or backward, and then pulling the crank-connecting rod mechanism, so that the moving plate 31b can perform mold clamping and mold opening actions at high speed and smoothly. The positioning bearing 31i and the radial thrust bearing 31q are combined to form a high-rigidity support for the ball screw, which can allow the ball screw to rotate at high speed. The injection mold is arranged at one end, which greatly improves the utilization efficiency of the factory space.

[0154] In this embodiment, the structure of the mold adjusting device 34 used for the mold clamping unit 3 of the injection molding machine is shown in FIG. Fig.16(a) to (b), the mold adjustment device 34 is arranged on the tail plate 31e of the mold clamping unit of the injection molding machine, and is used to drive the mold clamping unit to move relative to the guide rail composed of multiple tie rods 31a, and includes a gear motor 34h, a chain 34f and a sprocket mold adjustment screw nut 34c respectively screwed on the tail end of each tie rod 31a. The gear motor 34h drives the sprocket mold adjustment screw nut 34c on each tie rod 31a to rotate synchronously through the chain 34f. The device also includes a clamping plate 34e, and the clamping plate 34e and the tail plate 31e are separated on both sides of the sprocket mold adjustment screw nut 34c. At least two sprocket mold adjustment screw nuts 34c form a group and share a clamping plate 34e. A fixed distance fixing rod 34d is connected between the clamping plate 34e and the tail plate 31e. More specifically: the front and rear sides of the sprocket mold adjustment screw nut 34c in this embodiment are respectively provided with a front plate thrust bearing 34q and a rear plate thrust bearing 34r. The gear motor 34h is arranged on the tail plate 31e through the motor seat 34i, and drives the chain 34f to move through the driving small sprocket 34a. The motor seat 34i can rotate around the driving small sprocket 34a as the center, and the motor seat 34i is also provided with a driven small sprocket 34b, which is eccentrically arranged on the motor seat 34i relative to the driving small sprocket 34a. Each sprocket adjustment screw nut 34c is located on the inner side of the chain 34f, and the driven small sprocket 34b and the driving small sprocket 34a are separated on the inner and outer sides of the chain 34f. In this embodiment, an idler wheel 34g is also arranged on the tail plate 31e. The idler wheel 34g is located on the outer side of the chain 34f. The idler wheel 34g is used to cooperate with the driven small sprocket 34b and the driving small sprocket 34a to tighten the chain 34f. The guide rail in this embodiment is composed of four rectangular tie rods 31a, and the sprocket die adjustment screw nuts 34c on two adjacent tie rods 31a are a group and share a clamping plate 34e. Furthermore, the die adjustment device 34 in this embodiment also includes two travel switches 34m located on one side of the tail plate 31e and arranged along the length direction of the tie rod 31a, and a pressure rod 34j connected to the tail plate and located between the two travel switches 34m. The two travel switches 34m are preferably arranged on a switch seat 34k located on one side of the tail plate 31e. The travel switch 34m cooperates with the pressure rod 34j to limit the die adjustment stroke.

[0155] The mold adjusting device 34 of this embodiment is installed 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 clamped just right when clamping the mold, and a suitable clamping force can be achieved. During operation, the gear motor 34h drives the active small sprocket 34a to rotate, drags the chain 34f, and rotates the four sprocket mold adjusting screw nuts 34c. The sprocket mold adjusting screw nuts 34c are screwed together with the pull rod 31a and clamped between the clamping plate 34e and the tail plate 31e. The fixed distance fixing rod 34d determines the distance between the clamping plate 34e and the tail plate 31e, ensuring that the reasonable gap between the sprocket mold adjusting screw nuts 34c and the clamping plate 34e and the tail plate 31e is generally 0.1mm, and can rotate freely relative to the tail plate 31e at a fixed distance. Therefore, the rotation of the sprocket mold adjusting screw nuts 34c causes the tail plate 31e to move along the pull rod 31a, changing the clamping position of the moving plate 31b, and achieving the purpose of adjusting the mold thickness. The driven small sprocket 34b is installed on the mold adjustment motor seat 34i, and is used to tension the chain 34f. The tensioning method is: rotating the mold adjustment motor seat 34i with the active small sprocket 34a as the center, so that the driven small sprocket 34b deflects and presses the chain 34f to achieve the tensioning purpose. Every two sprocket mold adjustment screw nuts 34c share a clamping plate 34e, which is not easy to get stuck during the mold adjustment process. The entire mold adjustment device is simple, efficient and stable.

[0156] In this embodiment, the structure of the injection component 32 used in the injection molding machine is shown in FIG. Fig.12(a) to (b), including: an injection unit, a nozzle connected to one end of the injection unit, and a movement 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 for driving the ball screw transmission assembly to move, the nozzle is connected to the front end of the injection unit, the ball screw transmission assembly is connected to the injection screw 32f through the injection force sensor 32h, and drives the injection screw 32f to reciprocate. More specifically: the ball screw transmission assembly in this embodiment includes: an injection ball screw 32p, an injection transmission shaft 32k and a guide plate 32i; wherein the injection transmission shaft 32k is a hollow structure, sleeved outside the nut portion of the injection ball screw 32p, rotatably connected to the box 32g, and used for transmission connection with the servo motor assembly, the guide plate 32i is connected to the front end of the screw portion of the injection ball screw 32p, and is slidably connected to the box 32g through the injection guide rail 32y, and is used to drive the injection screw 32f to reciprocate. Furthermore, the rear end of the injection screw 32f is connected to a screw connection seat 32z, and the injection force sensor 32h is arranged between the guide plate 32i and the screw connection seat 32z. The center of the guide plate 32i is connected to the screw portion of the injection ball screw 32p, and the injection guide rail 32y is composed of two slide rails symmetrically arranged relative to the screw portion of the injection ball screw 32p. The injection transmission shaft 32k is rotatably connected to the housing 32g through the radial thrust bearing 32j and the unloading bearing 32n sleeved on the front and rear parts thereof, respectively. The housing 32g is also connected to the unloading bearing seat 32m matching the unloading bearing 32n. The rear end of the injection transmission shaft 32k extends backward and out of the housing 32g, and is used for transmission connection with the servo motor assembly. The servo motor assembly includes an injection servo motor 32t fixedly arranged relative to the housing 32g and an injection synchronous belt assembly for transmission connection between the output shaft of the injection servo motor 32t and the injection transmission shaft 32k. The injection synchronous belt assembly includes an injection large synchronous pulley 32q sleeved on the rear end of the injection transmission shaft 32k, an injection active synchronous pulley connected to the output shaft of the injection servo motor 32t, and an injection synchronous belt 32r for connecting the injection large synchronous pulley 32q and the injection active synchronous pulley. The injection servo motor 32t in this embodiment is fixed to one side of the outer side of the housing 32g through the injection motor seat 32s. The shooting unit in this embodiment includes: a shooting base slide 32v, a shooting base guide pair 32u and a tensioning cylinder 32w; the shooting base slide 32v is arranged on the box body 32g, the shooting base guide pair 32u is used for the sliding of the shooting base slide 32v, and the tensioning cylinder 32w is used to connect the box body 32g and the moving plate 31b of the injection molding machine, so that the nozzle is close to the front mold 22 during injection.

[0157] The working process of the injection component is as follows: the tension cylinder 32w moves the entire injection component 32, so that the nozzle part 32a is pressed against the mold injection gate or detached. When the machine controller sends a signal for injection, the nozzle switch cylinder 32x drives the rotating valve core 32d to rotate 90 degrees, so that the nozzle part 32a is connected to the injection cavity; the injection servo motor 32t rotates, and drives the injection ball screw 32p through the belt drive - generally a heavy-duty large steel ball ball screw is used to rotate, and the guide plate 32i pushes the injection screw 32f forward along the injection guide rail 32y through the injection force sensor 32h to inject and maintain pressure. The injection force is controlled by the controller of the injection servo motor 32t and the injection force sensor 32h in a closed loop. After the injection is completed, the nozzle switch cylinder 32x drives the rotating valve core 32d to rotate 90 degrees, and the injection cavity is connected to the melt component 33, and the melt from the melt component 33 pushes the injection screw 32f backward. Under the closed-loop control of the force sensor, the backward resistance of the injection screw 32f during the melt, i.e., the back pressure, can be accurately controlled. The injection parts are coaxially installed as a whole, without the external parts that move linearly with the screw like conventional injection platforms; the injection pressure and the pressure of the melt during the storage of the melt, i.e., the back pressure, are closed-loop controlled through the force sensor and servo control system; the rotary valve core is placed vertically to facilitate the discharge of gap residues.

[0158] In this embodiment, the structure of the nozzle for the injection molding machine injection component 32 is shown in FIG. Figures 13-14, including a nozzle body, an injection screw 32f, a bridge connection hole and a nozzle switch, wherein: the nozzle body has a fluid channel inside and is provided with a nozzle thermocouple 32e; the injection screw 32f is inserted at the rear of the fluid channel and can move axially; the bridge connection hole is connected to the fluid channel in front of the injection screw 32f, used to connect the bridge 33a, and receive the molten glue through the molten glue channel arranged inside the bridge 33a; the nozzle switch is used to switch the connection between the fluid channel before and after the bridge connection hole and the connection between the fluid channel behind the bridge connection hole and the molten glue channel of the bridge 33a. More specifically: the nozzle body of this embodiment is composed of a nozzle flange 32c and a nozzle part 32a connected to the front end of the nozzle flange 32c, and the connection between the fluid channel and the bridge connection hole is located on the nozzle flange 32c. The nozzle part 32a is covered with a heater 32b. The nozzle switch in this embodiment includes a rotating valve core 32d and a valve core driving assembly for driving the rotating valve core 32d to rotate. The rotating valve core 32d is inserted at the connection between the fluid channel and the bridge connection hole. The rotating valve core 32d is provided with a three-way hole for switching the connection between the front and rear fluid channels of the bridge connection hole and the connection between the rear fluid channel of the bridge connection hole and the melt channel of the bridge 33a. Preferably, the three-way hole is T-shaped, and the valve core driving assembly is used to drive the rotating valve core to swing back and forth by 90°. At this time, when the front and rear fluid channels of the bridge connection hole are connected, two through holes arranged opposite to each other in the three-way hole connect the front and rear fluid channels of the bridge connection hole, and the other through hole faces away from the bridge connection hole; when the rear fluid channel of the bridge connection hole is connected to the melt channel of the bridge 33a, two through holes perpendicular to each other in the three-way hole connect the rear fluid channel of the bridge connection hole to the melt channel of the bridge 33a, and the other through hole faces away from the bridge connection hole. The rotary valve core 32d in this embodiment is provided with multiple damping grooves 32d1, and a material collection channel is provided in the rotary valve core 32d. The inlet end of the material collection channel is connected to the damping groove 32d1 through a small hole provided in a damping groove 32d1, and the outlet end leads to the end of the rotary valve core 32d. Furthermore, in this embodiment, the rotary valve core 32d is vertically arranged, the bottom end of the rotary valve core 32d passes through the nozzle body and is located below the nozzle body, and the outlet end of the material collection channel leads to the bottom end of the rotary valve core 32d. It is convenient to discharge the residual material in the gap. The valve core drive assembly in this embodiment includes a crank connecting rod mechanism and a nozzle switch cylinder 32x connected to the rotary valve core 32d in sequence. The fluid channel in this embodiment is composed of a nozzle cavity and an injection cavity connected one after the other, and a bridging connection hole is arranged at the connection between the nozzle cavity and the injection cavity, and the shape of the injection cavity matches the injection screw 32f. The portion of the injection screw 32f extending into the fluid channel is provided with a plurality of unloading grooves 32f1. The unloading grooves 32f1 can effectively limit the leakage of the molten glue under high pressure and are highly pressure-resistant. In this embodiment, it is further preferred that the injection screw 32f is a pointed cylindrical structure, and the unloading grooves 32f1 are provided in the cylindrical portion of the injection screw 32f.Furthermore, the injection screw 32f is provided with a discharge channel 32f2, the inlet end of the discharge channel 32f2 is connected to the discharge groove 32f1 through a small hole provided in the discharge groove 32f1, and the outlet end, namely the discharge hole 32f3, is located at the rear of the injection screw 32f. The discharge channel 32f1 is provided to discharge the leaked molten glue in a directional manner. The molten glue at the end of the injection screw 32f is renewed by leakage, which effectively avoids the problem of the screw head pad being retained for a long time and degrading and contaminating the product. The rear end of the injection screw 32f of this embodiment is also provided with a grooved shaft neck 32f4. The grooved shaft neck 32f4 is used to connect with the element that drives the injection screw 32f to move, thereby realizing the loosening function.

[0159] In this embodiment, the structure of the melt-melting component 33 used in the injection molding machine is shown in FIG. Fig.15(a) to (b), including a barrel 33e, a bridge 33a, a melt glue screw 33f, a melt glue screw driving assembly and a melt glue component moving assembly, wherein: the barrel 33e has a material inlet, and is wrapped with a heating tube 33g on the outside; the bridge 33a is vertically connected to the front end of the barrel 33e and communicates with the barrel 33e, and is used to connect with the injection component 32 to provide melt glue, and the bridge 33a is wrapped with a heating tube 33g on the outside; the melt glue screw 33f is inserted into the barrel 33e, the melt glue screw driving assembly is used to drive the melt glue screw 33f to rotate, and the melt glue component moving assembly is used for the melt glue component 33 to follow the injection component 32. More specifically: in this embodiment, the bridge 33a in this embodiment is vertically connected to the front end of the barrel through a right-angle flange 33b. The melt screw driving assembly includes a melt servo motor 33m and a melt reducer 33k which are in transmission connection. The melt reducer is in transmission connection with the melt screw 33f via a melt transmission shaft 33n. The melt component moving assembly includes a melt guide pair 33r, which is arranged on a melt bracket 33s, and a melt bearing seat 33j and a barrel seat 33h are both slidably connected to the melt guide pair 33r. The melt component 33 slides along the guide pair 33r under the drive of the injection component 32, thereby realizing synchronous movement with the injection component 32. The melt glue component 33 also includes a detachably connected melt glue bearing seat 33j and a barrel seat 33h. The tail end of the barrel 33e is fixed to the barrel seat 33h. The tail end of the melt glue screw 33f is connected to a bearing through a connecting flange 33i. The bearing is rotatably connected to the melt glue bearing seat 33j. The melt glue screw drive assembly is arranged on the melt glue bearing seat 33j and is transmission-connected to the melt glue screw 33f. The melt glue component 33 also includes a melt glue screw moving cylinder 33p. The cylinder body and cylinder rod of the melt glue screw moving cylinder 33p are respectively connected to the melt glue bearing seat 33j and the barrel seat 33h. The melt glue screw moving cylinder 33p can axially move the melt glue screw 33f, and assist in the work when the machine is stopped to clean the residual glue and disassemble the melt glue screw 33f. The melt glue component 33 also includes a plurality of melt glue thermocouples 33c, which are used to measure the temperature of the barrel 33e. The heating cylinder 33g cooperates with the melt thermocouple 33c under the control of the melt temperature control box 33d to accurately control the temperature of the barrel, preheat the plastic particles and keep them warm.

[0160] When the melt-melting component 33 melts, the heating tube 33g preheats the barrel 33e, the right-angle flange 33b, and the bridge 33a to the specified temperature, and the melt-melting screw drive assembly drives the melt-melting screw 33f to rotate, so that the solid plastic continuously enters the barrel 33e from the feed port, is heated, extruded, sheared, and plasticized and melted into a melt. The melt is squeezed into the injection component 32 through the right-angle flange 33b and the bridge 33a. In this embodiment, the melt-melting component 33 is separated from the conventional melt-melting injection component and connected to another injection component 32 through the bridge 33a. In practice, it is preferred to set the melt-melting component 33 on one side of the injection component 32, that is, the two are set side by side and move synchronously; the melt-melting action is independent of other actions such as injection and mold closing, so it can be melted synchronously during other actions, avoiding the melt occupying the cycle time and improving efficiency.

[0161] The injection molding process of the injection molding machine in this embodiment includes the following steps:

[0162] S1: The front molds 21 on the N clamping units 3 are respectively clamped with the N rear molds 21 of the corresponding rear mold group under the drive of the transmission device 31, and the melt injection component melts the plastic and injects it into the mold cavity through the front mold 22 to perform injection molding of the product;

[0163] S2: mold opening;

[0164] S3: The mold transfer table 1 rotates to exchange the positions of the two rear mold assemblies;

[0165] S4: Take out the product;

[0166] S5: Execute steps S1 to S4 in a loop.

[0167] In this embodiment, step S4 is preferably performed simultaneously with step S1. Step 4 of this embodiment preferably also includes the step of inserting an insert into the rear mold 21 after the product is taken out.

[0168] Specifically, in the mold closing state, there can be melt / injection / nozzle valve opening actions; in the injection state, there can be ejection / blowing / vacuum / finished product removal actions; in the mold opening state, there can be mold rotation / melt / vacuum inserting / nozzle valve closing actions. This can achieve two of the four sets of rear molds for injection molding while the other two sets are taking out parts and placing inserts. The next cycle is switched over, and the two sets of rear molds that have been injection molded take out parts, and the two sets of rear molds that have taken out parts and placed inserts are injection molded. The two sets of front molds can continuously inject while taking out parts and inserting inserts. One cycle process only takes 4.0s. The conventional injection molding machine is mainly composed of a frame 6, a conventional injection unit 7, a conventional single set of molds 8, a conventional clamping unit (a conventional hinged clamping unit 9 or a conventional direct pressure clamping unit 10), a controller 4 and a safety shield plate 5. Its structure can be seen in Figures 1-2 The injection molding process of this embodiment is compared with the conventional injection molding process (such as Figure 3 As shown, it takes 9.0s), which greatly saves time.

[0169] In short, the present invention can realize the installation of multiple sets of molds on one machine, and the multiple sets of molds can work synchronously and alternately, avoiding the problem that a set of molds of a conventional injection molding machine cannot be injected, pressurized and cooled when taking out products and inserting inserts, and also realizes the improvement of the utilization rate of molds, especially the front mold of hot runner molds, improving machine stability, factory space utilization, and reducing labor. The injection molding process of the present invention can be carried out synchronously and alternately with multiple molds and multiple actions, realizing a process that cannot be achieved by conventional injection molding machines, and achieving higher work efficiency.

[0170] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A rotary die table for an injection molding machine, characterized in that: include: A polyhedron is rotatably arranged, has 2N side elevations uniformly distributed along the circumference of the rotation direction, and is used to fix two rear mold groups, each of the rear mold groups has N rear molds (21), and the N rear molds (21) of the two rear mold groups are used to alternately close the molds with the N front molds (22) during the rotation of the polyhedron; N=2, and the rear molds (21) of the two rear mold groups are alternately arranged along the circumference of the rotation direction of the rotating mold table (1) and are uniformly distributed; the polyhedron is a hexahedron (1f) and has four side elevations, and the two rear molds (21) of each rear mold group are symmetrically arranged on two opposite side elevations; The rotary die table (1) further comprises: A frame-type support is surrounded by the hexahedron (1f) and is fixedly arranged; the frame-type support is composed of four columns (1a) surrounded by the hexahedron (1f) and a rotating mold base (1n) and a rotating mold stand (1g) respectively located at the bottom and top of the four columns (1a); Heavy-duty slewing assembly for the rotational connection of a hexahedron (1f) and a frame support. The embedded unloading kit (12) is composed of a groove flange (1q), a flange flange (1r) and a suspension rod mechanism for connecting the groove flange (1q) and the flange flange (1r). The groove flange (1q) is fixed on a frame support and has a groove whose length direction is parallel to the straight line direction where the two front molds (22) are located. The flange flange (1r) is engaged with the groove flange (1q) and can move relative to the groove flange (1q) along the length direction of the groove. The mold transfer table rotating assembly is fixed on the flange (1r) and is transmission-connected to the heavy-load rotary assembly through the flange (1r); the mold transfer table rotating assembly is composed of a mold transfer servo motor (1m), a mold transfer reducer (1k) and a mold transfer transmission shaft (1j) that are transmission-connected; the mold transfer transmission shaft (1j) is connected to the heavy-load rotary assembly.

2. A rotary die table for an injection molding machine according to claim 1, characterized in that: The heavy-load rotary assembly is used for the rotational connection between the hexahedron (1f) and the frame-supported rotary mold base (1n) and the rotary mold stand (1g); the groove flange (1q) is fixed to the bottom of the rotary mold base (1n).

3. A rotary die table for an injection molding machine according to claim 1, characterized in that: The heavy-load rotary assembly comprises an upper flange shaft (1e) connected to the top of the hexahedron (1f) and passing through the rotary mold stand (1g), an upper heavy-load copper sleeve (1b) arranged between the rotary mold stand (1g) and the upper flange shaft (1e), an upper flange cover (1c) arranged on the rotary mold stand (1g) and matching 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 passing through the rotary mold stand (1n), a lower heavy-load copper sleeve (1p) arranged between the rotary mold stand (1n) and the lower flange shaft (1h), and a lower thrust bearing (1i) arranged between the groove flange (1q) and the lower flange shaft (1h).

4. A rotary die table for an injection molding machine according to claim 1, characterized in that: The hexahedron (1f) is provided with four ejecting devices (11) respectively matching four rear molds (21). The four ejecting devices all have an ejecting servo motor (11a) and an ejector pin rod (11i) which are offset and drivingly connected. The four ejecting devices are staggeredly installed 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 elevations of the hexahedron (1f).

5. A rotary die table for an injection molding machine according to claim 4, characterized in that: The ejecting servo motor (11a) of the ejecting device (11) is connected to the screw rod part of the ejector pin ball screw (11d) through a coupling (11b). The front and rear ends of the screw rod part are respectively passed through the front mounting plate (11f) and the rear mounting plate (11c) through ejector pin screw bearings (11g). An installation side plate (11e) is connected between the front mounting plate (11f) and the rear mounting plate (11c) and forms a "C" - shaped structure. A rolling guide rail (11h) parallel to the screw rod part is also provided between the front mounting plate (11f) and the rear mounting plate (11c). The nut part of the ejector pin ball screw (11d) is connected to an ejector pin plate (11j) passing through the rolling guide rail (11h). The ejector pin rod (11i) passes through the front mounting plate (11f), and the rear end of the ejector pin rod (11i) is fixed to the ejector pin plate (11j).

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