CN108000801B - Independent opening and closing mold injection molding machine with disc and injection molding method - Google Patents

Abstract

The invention discloses an injection molding machine with a disc type independent mold opening and closing and an injection molding method. The injection molding method comprises the steps of installing a mold, closing the mold, injecting, opening the mold and ejecting. By utilizing the technical scheme of the invention, the independent mold opening and closing of the injection molding machine can be realized, the functions of the injection molding machine are increased, and the production efficiency is improved; the materials are fully and uniformly preheated before entering the charging barrel, so that the energy loss in the charging barrel is reduced; after the materials enter the charging barrel, the temperature of the materials in the charging barrel can be better controlled; for the nozzle structure, the needle valve can be independently controlled to be opened and closed, the nozzle can be cooled during injection molding, and the performance is stable and reliable, so that raw materials are prevented from being overheated and salivated.

Description

Independent opening and closing mold injection molding machine with disc and injection molding method

Technical Field

The invention relates to an injection molding machine.

Background

In the prior art, an upper template of a vertical injection molding machine is a whole, two sets of molds are installed on the vertical injection molding machine, and when the molds are opened and closed, upper molds of the two sets of molds can move simultaneously, so that the functions of the injection molding machine are limited, the two sets of molds can only produce the same product, the opening and closing of one set of mold can not be controlled independently, double-color injection molding and different products can not be carried out, a pair of upper molds can not be installed, and when one set of mold is used for injection molding, the other pair of lower molds can finish the operation of taking a workpiece.

In addition, when the injection molding machine performs injection molding, the materials in the hopper are generally solid, and if the materials at normal temperature are directly input into the charging barrel, the materials in the charging barrel need to absorb a large amount of heat, so that the temperature in the charging barrel is required to be higher, and the uniform temperature of the materials in the charging barrel cannot be ensured. In addition, because the material is in a molten state in the charging barrel, the fluidity is good, after injection molding is stopped, although the injection molding machine stops pressurizing, the raw material in the charging barrel still has residual pressure, if the material nozzle is not blocked in time, the material can flow out from the feeding hole of the cavity, and flow casting is formed, so that the product quality is influenced. At present, two main types of material nozzles are closed by using a needle valve, one type is that the needle valve is arranged in the material nozzle, the top end of the needle valve is matched with a discharge port, the tail end of the needle valve is provided with a spring, the needle valve is compressed by the pressure of raw materials and moves backwards during injection molding, the raw materials can pass through a nozzle, after the injection molding is finished, the injection molding machine stops pressurizing, the spring resets, and the needle valve is pushed to close a feed port. The device has the advantages of simple structure and the defect that the injection pressure must be high enough to overcome the acting force of the spring so as to open the nozzle, and the high pressure can further heat the raw materials to cause chemical changes such as degradation, and the device is particularly not suitable for the raw materials such as silica gel and the like which need low-temperature injection molding. The other is to use external force to drive the needle valve, which requires a relatively complex mechanical structure, which is expensive and costly to maintain.

Disclosure of Invention

The invention aims to provide an independent open-close mold injection molding machine with a disk and an injection molding method. By utilizing the technical scheme of the invention, the independent mold opening and closing of the injection molding machine can be realized, the functions of the injection molding machine are increased, and the production efficiency is improved; the materials are fully and uniformly preheated before entering the charging barrel, so that the energy loss in the charging barrel is reduced; after the materials enter the charging barrel, the temperature of the materials in the charging barrel can be better controlled; for the nozzle structure, the needle valve can be independently controlled to be opened and closed, the nozzle can be cooled during injection molding, and the performance is stable and reliable, so that raw materials are prevented from being overheated and salivated.

In order to achieve the purpose, the injection molding machine with the disc type independent mold opening and closing comprises a disc fixing seat, a rotating disc, a central rotating shaft, more than two independent mold opening and closing mechanisms and an injection device, wherein the independent mold opening and closing mechanisms and the injection device are arranged on the disc fixing seat;

the central rotating shaft is arranged in the center of the disc fixing seat, the rotating disc is arranged on the disc fixing seat through the central rotating shaft, and the disc fixing seat is provided with a driving mechanism for driving the rotating disc; the independent mold opening and closing mechanism comprises a lower template, a mold locking oil cylinder, an upper template and more than two mold locking machine columns, wherein the lower template is arranged at the lower ends of the mold locking machine columns, the mold locking oil cylinder is connected with the lower template, and the upper template is arranged at the upper ends of the mold locking machine columns;

the disc fixing seat is provided with an ejection mechanism, the ejection mechanism comprises more than two guide rods arranged on the disc fixing seat, the lower ends of the guide rods are provided with ejection oil cylinders, the guide rods are provided with sliding plates in a sliding manner, and the sliding plates are provided with more than two ejector rods; a rod body is arranged on the rack, two sliding lantern rings are arranged on the rod body, a locking mechanism is arranged on each lantern ring, and a position sensor is arranged on each lantern ring;

each upper template is provided with a material injection device; the material injection device comprises a first oil cylinder, a second oil cylinder, a motor, a guide rod, a charging barrel assembly and a hopper; the two first oil cylinders comprise first cylinder bodies and first piston rods, the upper ends of the first piston rods are arranged in the first cylinder bodies, the lower ends of the first piston rods are fixed on the upper template, and first connecting seats are arranged between the first cylinder bodies; the number of the second oil cylinders is two, each second oil cylinder comprises a second cylinder body and a second piston rod, the upper end of each second piston rod is arranged in the corresponding second cylinder body, the lower end of each second piston rod is fixed on the corresponding first cylinder body, and a second connecting seat is arranged between the corresponding second cylinder bodies; the motor is arranged on the second connecting seat; the guide rod is arranged on the upper template, a first guide seat is arranged on the first cylinder body, a second guide seat is arranged on the second cylinder body, and the guide rod penetrates through the first guide seat and the second guide seat in a sliding manner;

the charging barrel component comprises a charging barrel, a screw, a charging nozzle seat and a charging nozzle; the charging barrel is fixed on the first connecting seat, the charging barrel is arranged outside the screw rod, and the screw rod penetrates through the first connecting seat and is connected to an output shaft of the motor; the material nozzle base is arranged at one end of the charging barrel, and the material nozzle is arranged on the material nozzle base; more than two heating rings are sleeved outside the charging barrel, gaps are reserved between adjacent heating rings, and temperature sensors are arranged on the heating rings and the charging barrel; a heat insulation cover is arranged outside the heating ring, the end face of the heat insulation cover is an opening, a cavity is formed between the heat insulation cover and the heating ring, and a fan corresponding to the heating ring is arranged on the heat insulation cover;

the material nozzle comprises a material nozzle body, a seat sleeve, a rear seat and a needle valve, the rear seat is connected to one end of the material cylinder, a material cavity and a discharge hole are formed in the material nozzle body, the material nozzle body is arranged at one end of the seat sleeve, the rear seat is arranged at the other end of the seat sleeve, a nozzle sleeve is arranged at one end, connected with the material nozzle body, in the seat sleeve, a cavity is formed by the nozzle sleeve, a piston is arranged in the cavity, the needle valve is fixed on the piston, the needle valve penetrates through the nozzle sleeve and is inserted into the material cavity, a first air passage and a first air inlet communicated with the first air passage are arranged on the seat sleeve, the first air passage is communicated with the cavity, a second air passage and a second air inlet communicated with the second air passage are arranged on the rear seat or the seat sleeve, the second air passage is communicated with the cavity, the second air passage is arranged on the other side of the piston, a first flow passage is arranged on the rear seat sleeve, a third, the first flow channel, the second flow channel and the third flow channel are communicated, the third flow channel is communicated with the material cavity, the first flow channel, the second flow channel and the third flow channel form a flow channel, and more than one flow channel is arranged;

the hopper comprises a hopper basket and a blanking pipe, the upper end of the blanking pipe is connected with the lower end of the hopper basket, and the lower end of the blanking pipe is connected with the charging barrel; a heating plate is arranged in the hopper basket, the heating plate is provided with a notch, a plurality of heating plates are arranged in a criss-cross mode, a cavity is arranged in the heating plate, the cavity penetrates through the side wall of the hopper basket, and a heating element is arranged in the cavity; the blanking device is characterized in that a blanking notch and a sliding groove are formed in the lower end of the blanking pipe, the discharging pipe is arranged around the blanking notch, a sliding piece is arranged at the position, corresponding to the blanking notch and the sliding groove, of the inner wall of the blanking pipe, and a sliding rod is arranged on the sliding piece.

The injection molding method of the independent open-close mold injection molding machine with the disc shape is characterized in that:

(1) more than two sets of lower dies are arranged on the rotary disc, and an upper die is arranged on at least one upper die plate;

(2) starting a mold locking oil cylinder, wherein the mold locking oil cylinder drives a lower template, a mold locking machine column and an upper template to move, so that mold closing and mold locking are realized;

(3) annotate the material through annotating the material device in to the mould, specific process is: adding the materials into the hopper basket, electrifying the heating plate, and preheating the materials in the hopper basket; compressed gas is introduced from the first gas inlet, the piston moves upwards under the action of the compressed gas, the piston drives the needle valve to move upwards, and the discharge hole is opened; then starting the first oil cylinder, and enabling the first cylinder body to drive the second oil cylinder, the second connecting seat, the material barrel, the screw rod and the motor to move downwards along the guide rod, so that the material nozzle is in contact with the die; starting a motor, driving a screw rod to rotate by the motor, feeding the preheated material into the charging barrel from the blanking pipe, conveying the material downwards under the action of the screw rod, starting a second oil cylinder, driving the screw rod to move downwards in a linear manner through the second oil cylinder, and extruding the material into a die from a discharge hole; in the process of injecting materials, heating is carried out through the heating ring, the temperature of the materials is measured through the temperature sensor, if the temperature is overhigh, the forced cooling is carried out through the fan, and after the fan is started, external air enters through the fan and flows out from two ends of the heat insulation cover; after the materials are injected, compressed gas is introduced from the second gas inlet, the piston moves downwards under the action of the compressed gas, the piston drives the needle valve to move downwards, and the needle valve blocks the discharge hole;

(4) cooling after the material injection is finished;

(5) opening the mold; starting a mold locking oil cylinder, driving a lower template to move upwards by the mold locking oil cylinder, driving an upper template to move upwards by the lower template through a mold locking machine column, and driving an upper mold to move upwards by the upper template to realize mold opening;

(6) and ejecting the product from the mold through an ejection mechanism.

According to the injection molding machine and the injection molding method, the mold opening and closing mechanism is independently arranged and installed on the disc fixing seat, the mold locking force is provided by the mold locking oil cylinder, the mold opening and closing of the upper mold can be independently controlled, the molds can be independently controlled, and one injection molding machine is equivalent to two or more injection molding machines; can be used for double-shot molding or producing different products; and a pair of upper dies and more than two pairs of lower dies can be used for production, so that the production efficiency is improved.

According to the invention, after the material enters the material barrel, the rotation of the screw rod enables the material to generate shearing heat, meanwhile, the material is heated through the heating ring, the temperature of the material is measured through the temperature sensor, if the temperature is too high, the temperature is forcibly reduced through the fan, and after the fan is started, external air enters through the fan and flows out from the two ends of the heat insulation cover, so that the temperature reduction efficiency can be improved, and the temperature can be better controlled.

In the invention, the material extruded from the injection molding machine can uniformly reach the discharge port along the flow channel, when the injection molding is started, the air is introduced to the first air inlet, the needle valve is driven by the piston to move backwards under the action of air pressure, the needle valve is separated from the discharge port, after the injection molding is finished, the air introduction to the first air inlet is stopped, the air introduction to the second air inlet is stopped, and the needle valve is driven by the piston to move forwards under the action of the air pressure, so that the discharge port is closed. The device has the advantages of timely response, simple and convenient operation and reliable performance.

Because set up the hot plate in the hopper basket, the material enters into the hopper basket in the back, can preheat the material through a plurality of hot plates, and preheats evenly, reduces the consumption of feed cylinder energy.

Furthermore, the outer circumference of the rotating disc is provided with a rack, the driving mechanism comprises a driving motor and a driving gear, the driving motor is fixed on the disc fixing seat, the driving gear is connected with a motor output shaft, and the driving gear is meshed with the rack. The gear and rack transmission is simple in structure and reliable in operation.

Furthermore, a rolling bearing is arranged at the center of the rotating disc, the rolling bearing is fixed on the rotating disc through a bearing fixing seat, and the rolling bearing is matched with the central rotating shaft. Through setting up antifriction bearing, can reduce the friction between rotating disc and central pivot, make rotating disc rotate steadily. One of the mold locking machine columns of each mold opening and closing mechanism penetrates through the central rotating shaft, and a sliding bearing is arranged between the mold locking machine column penetrating through the central rotating shaft and the central rotating shaft. One of the mold locking machine columns of each mold opening and closing mechanism penetrates through the central rotating shaft, so that the mold locking force provided by the mold locking oil cylinder can be well balanced, and the mold opening and closing mechanisms can be uniformly arranged on the injection molding machine.

Furthermore, a sliding device is arranged between the disk fixing seat and the rotating disk. The sliding device can reduce the friction between the disk fixing seat and the rotating disk, and the disk fixing seat and the rotating disk are not damaged. The sliding device preferably selects a copper block, the friction coefficient of copper and iron is small under the condition that the contact surface is smooth and lubrication is provided, the cost of the selected copper block is low, and the replacement is convenient. The rotating disc is provided with a turntable in-place detection switch. Through setting up the carousel and detecting switch that targets in place, enable the rotating circular disc to drive the lower mould and stop at preset position, with last mould cooperation, accomplish and mould plastics.

Furthermore, the locking mechanism is a locking screw, and the locking screw acting with the rod body is arranged on the lantern ring. The position of the lantern ring is convenient to adjust.

Furthermore, 8 heating rings are arranged, and 8 fans are arranged; one end of the charging barrel, which is far away from the charging nozzle, is sleeved with a cooling ring. Set up 8 heating rings and fans, carry out segmentation heating and cooling, the efficient of heating and cooling, the temperature is well controlled. And a cooling ring is arranged to cool the material entering the charging barrel.

Furthermore, a front cover is arranged at one end, close to the discharge port, of the material nozzle body, a first water channel and a second water channel are arranged in the material nozzle body, a water cavity is arranged between the front cover and the material nozzle body, a third water channel, a fourth water channel, a water inlet and a water outlet are arranged on the seat sleeve, the water inlet, the third water channel are communicated with the first water channel, and the first water channel is communicated with the water cavity; the second water channel and the fourth water channel are communicated with the water outlet, and the second water channel is communicated with the water cavity. Through setting up water course and water cavity, the material in the cooling hydroenergy cooling material mouth is convenient for control the temperature of moulding plastics to improve the quality of injection moulding product.

Furthermore, the front end of the needle valve is conical, the tail end of the needle valve is provided with threads, the threads are provided with nuts, and the needle valve is fixed on the piston through the nuts. The nut is used for connecting and fixing, the structure is simple, and the fixation is reliable.

Furthermore, an upper mounting plate is arranged at the upper end of the blanking pipe, and a lower mounting plate is arranged at the lower end of the blanking pipe; the sliding grooves comprise axial sliding grooves and radial sliding grooves; the sliding rod is provided with a large end and a small end, the small end slides along the sliding groove, and the large end slides along the outer surface of the blanking pipe; a hopper cover is also arranged at the upper part of the hopper basket; the lower end of the discharge pipe is provided with an anti-skid groove; and an observation window is arranged on the side surface of the hopper basket close to the bottom. Go up the mounting panel and be convenient for install hopper basket and feed cylinder respectively with lower mounting panel, the observation window is convenient for observe the height of material.

Drawings

Fig. 1 is a schematic view of a separate split-mold injection molding machine of the belt disk type.

Fig. 2 is a side view of a separate split-mold injection molding machine of the type with a disk.

Fig. 3 is a structural view with the injection device removed.

Fig. 4 is a top view of fig. 3.

Fig. 5 is a structural diagram of the injection molding machine with a disc type independent open-close mold, wherein the A ejector rod is ejected.

Fig. 6 is a structural view showing that the disc type independent open/close mold injection molding machine A, B is opened simultaneously and the ejector pins A, B are ejected simultaneously.

Fig. 7 is a structural diagram of the opening of a B-type independent open-close mold injection molding machine with a disc and the ejection of a B ejector rod.

Fig. 8 is a schematic view of a cartridge assembly.

Fig. 9 is a cross-sectional view of the cartridge assembly.

Fig. 10 is a cross-sectional view of the mouthpiece airway and water channel.

Fig. 11 is a cross-sectional view of a nozzle flow channel.

Fig. 12 is a schematic structural view of the nozzle.

Fig. 13 is a perspective view of the hopper.

Fig. 14 is a top view of the hopper.

Fig. 15 is a sectional view taken along line a-a in fig. 14.

Fig. 16 is a sectional view taken along line B-B of fig. 14.

Fig. 17 is a schematic view of an ejection mechanism.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 4, the injection molding machine with a disc type independent mold opening and closing comprises a frame 100, a disc fixing seat 1, a rotating disc 2, a central rotating shaft 3, two independent mold opening and closing mechanisms arranged on the disc fixing seat 1, an ejection mechanism and an injection device.

The disc fixing seat 1 is provided with a driving mechanism 4 for driving the rotary disc 2, the driving mechanism 4 comprises a driving motor 41 and a driving gear 42, the driving motor 41 is fixed on the disc fixing seat 1, the driving gear 42 is connected with a motor output shaft, the outer circumference of the rotary disc 2 is provided with a rack 21, the driving gear 42 is meshed with the rack 21, and the rack and the gear are in transmission structure, simple in structure and reliable in operation.

Center pivot 3 is established at the center of disc fixing base 1, and rotating disc 2 establishes on disc fixing base 1 through center pivot 3, and rotating disc 2's center is equipped with antifriction bearing 5, and antifriction bearing 5 passes through bearing fixing base 7 to be fixed on rotating disc 2, and antifriction bearing 5 and the cooperation of center pivot 3 through set up antifriction bearing 5 between rotating disc 2 and center pivot 3, can reduce the friction between rotating disc 2 and the center pivot 3, make rotating disc 2 steadily rotate.

Be equipped with copper billet 8 between disc fixing base 1 and rotating disc 2, copper and iron are smooth and have the lubricated condition under the coefficient of friction little at the contact surface, and copper billet 8 can reduce the friction between disc fixing base 1 and rotating disc 2, does not damage disc fixing base 1 and rotating disc 2. The cost of using the copper block is low, and the replacement is convenient.

The independent mould mechanism that opens and shuts includes lower bolster 9, mode locking hydro-cylinder 10, cope match-plate pattern 13, first mode locking machine column 14, second mode locking machine column 15 and third mode locking machine column 16, first mode locking machine column 14 is passed to lower bolster 9, the lower extreme of second mode locking machine column 15 and third mode locking machine column 16, lower bolster 9 is fixed by second lock nut 17, cope match-plate pattern 13 passes first mode locking machine column 14, the upper end of second mode locking machine column 15 and third mode locking machine column 16, cope match-plate pattern 13 is fixed by first lock nut 18. The upper template 13 and the lower template 9 are fixed by nuts, so that the structure is simple, the fixation is reliable, and the disassembly and the assembly are convenient.

Second mode locking machine post 15 passes central pivot 3, be equipped with slide bearing 6 between second mode locking machine post 15 and the central pivot 3, through setting up slide bearing 6, can reduce the friction between second mode locking machine post 15 and the central pivot 3, it is more smooth and easy to make the mould that opens and shuts, through the setting that passes central pivot 3 with second mode locking machine post 15, can balance the locking die power that mode locking hydro-cylinder 10 provided well, protection mode locking machine post, the life of extension injection molding machine.

The piston of the mould locking oil cylinder 10 is connected with the lower template 9, and the cylinder sleeve of the mould locking oil cylinder 10 is connected with the rack 100 or the disc fixing seat 1.

The rotating disc 2 is provided with a rotating disc in-place detection switch 19, and the rotating disc in-place detection switch can enable the rotating disc 2 to drive a lower die of the injection mold to stop at a preset position and be matched with an upper die to complete injection molding.

As shown in fig. 17, the ejection mechanism includes more than two guide rods 1c mounted on the disc fixing base, an ejection cylinder 2c mounted at the lower end of the guide rod 1c, a sliding plate 3c slidably mounted on the guide rod 1c, and more than two ejector rods 4c mounted on the sliding plate 3 c; a rod body 5c is installed on the rack, two sliding lantern rings 6c are arranged on the rod body, a locking mechanism is arranged on the lantern rings 6c, and a position sensor 7c is installed on the lantern rings. The lantern ring 6c is provided with a locking screw 8c which acts on the rod body, and the screw is convenient for adjusting the position of the lantern ring 6 c. This ejection mechanism drives the sliding plate motion through an ejection hydro-cylinder, and the sliding plate drives the ejector pin motion for the roof can be ejecting in step, improves ejecting quality, and in addition, the formation of sliding plate motion is detected through position sensor, after having set up the lantern ring, conveniently adjusts position sensor's position. The lantern ring form by two semi-ring combinations, be provided with the clamp outside the lantern ring, the clamp be elasticity clamp or lock larynx clamp. The lantern ring is the spline fit with the body of rod, avoids the lantern ring rotatory.

As shown in fig. 1 and 2, the injection device includes a first cylinder 71, a second cylinder 72, a motor 73, a guide rod 74, a cartridge assembly 75, and a hopper 76.

The number of the first oil cylinders 71 is two, the first oil cylinder 71 comprises a first cylinder body and a first piston rod, the upper end of the first piston rod is arranged in the first cylinder body, the lower end of the first piston rod is fixed on the upper template 3, and a first connecting seat 77 is arranged between the first cylinder bodies; the number of the second oil cylinders 72 is two, each second oil cylinder 72 comprises a second cylinder body and a second piston rod, the upper end of each second piston rod is arranged in each second oil cylinder, the lower end of each second piston rod is fixed on the corresponding first cylinder body, and a second connecting seat 78 is arranged between the corresponding second cylinder bodies; the motor 73 is mounted on the second connecting base 78; the guide rod 74 is mounted on the upper die plate 3, a first guide seat 711 is arranged on the first cylinder body, a second guide seat 721 is arranged on the second cylinder body, and the guide rod 74 slidably passes through the first guide seat 711 and the second guide seat 721.

As shown in fig. 8 and 9, the cartridge assembly 75 includes a cartridge 1a, a screw 2a, a nozzle holder 3a, a nozzle 4a, a drive shaft 7a, a heating ring 8a, a heat shield 9a, a fan 10a, and a temperature sensor 11 a.

The cartridge 1a is inserted into and fixed to the first coupling seat 77, a locking nut 13a is provided on the cartridge 1a, and a loosening prevention nut 14a is provided on the cartridge 1a at a side of the locking nut 13a to prevent the cartridge from being loosened from the first coupling seat 77.

The screw 2a extends into the barrel 1a from one end of the barrel 1 a; a nozzle holder 3a is attached to the other end of the barrel 1a, and a nozzle 4a is attached to the nozzle holder 3 a. The motor 73 is connected to the screw 2a via a transmission shaft 7 a.

More than two heating rings 8a are sleeved outside the charging barrel 1a, in the embodiment, 8 heating rings 8a are arranged, a gap is arranged between every two adjacent heating rings, a temperature sensor 11a is arranged on each heating ring 8a, and temperature sensors 11a are respectively arranged at the positions at the two ends of the charging barrel and used for detecting the temperature; a heat insulation cover 9a is arranged outside the heating ring 1a, an opening is formed between end surface material cylinders of the heat insulation cover 9a, a cavity is formed between the heat insulation cover 9a and the heating ring 8a, and a fan 10a corresponding to the position of the heating ring is arranged on the heat insulation cover.

A cooling ring 12a is sleeved on the end of the charging barrel 1a far away from the material nozzle. And cooling the material entering the material barrel.

After the material entered into the feed cylinder, the rotation of screw rod made the material produce shear heat, heated through the heating collar simultaneously, carried out the temperature measurement to the material through temperature sensor, if the high temperature, forced the cooling through the fan, after the fan starts, external wind got into through the fan, flowed from the both ends of insulating boot, like this, just can improve the efficiency of cooling, better controlled temperature.

As shown in fig. 10 to 12, the nozzle 4a includes a front cover 1b, a nozzle body 2b, a nozzle sleeve 3b, a seat sleeve 6b, a piston 5b, a needle valve 4b, a rear seat 7b, a nut 9b, and a screw 8 b.

A second sealing ring cavity 12b is arranged on the front cover 1b and between the side face of the front cover 1b and the side face of the nozzle body 2b, and a third sealing ring cavity 13b is arranged between the end face of the front cover 1b and the end face of the nozzle body 2 b.

The material nozzle body 2b is provided with a material cavity 21b, a material outlet 22b, a third flow channel 25b, a first water channel 23b and a second water channel 27b, a fourth sealing ring cavity 24b is arranged between the end surfaces of the material nozzle body 2b contacted with the seat sleeve 6b and positioned around the second water channel 27b, a first sealing ring cavity 28b is arranged between the end surfaces of the material nozzle body 2b contacted with the seat sleeve 6b and positioned around the first water channel 23b, and a tenth sealing ring cavity 210b is arranged between the end surfaces of the material nozzle body 2b contacted with the seat sleeve 6b and positioned around the second flow channel 62 b.

A sixth sealing ring cavity 32b is formed between the outer surface of the nozzle sleeve 3b and the inner surface of the seat sleeve b6 on the nozzle sleeve 3b, and a fifth sealing ring cavity 31b and a seventh sealing ring cavity 33b are formed between the inner surface of the nozzle sleeve 3b and the outer surface of the needle valve 4 b.

The seat cover 6b is provided with a first air passage 67b, a first air inlet 68b, a third water passage 64b, a fourth water passage 69b, a water inlet 65b and a water outlet 66 b.

An eighth seal cavity 51b is formed in the piston 5b between the outer surface of the piston 5b and the inner surface of the sleeve 6 b.

The rear seat 7b is provided with a first flow passage 72b, a second air passage 73b and a second air inlet 74b, a ninth seal ring cavity 75b is provided between both side surfaces of the rear seat 7b contacting the seat cover 6b, and an eleventh seal ring cavity 77b is provided around the first flow passage 72b between both end surfaces of the rear seat 7b contacting the seat cover 6 b. The rear seat 7b is mounted on the cartridge.

During assembly, the sixth sealing ring 35 is arranged in the sixth sealing ring cavity 32b of the nozzle sleeve 3b, the fifth sealing ring 34b is arranged in the fifth sealing ring cavity 31b, the seventh sealing ring 36b is arranged in the seventh sealing ring cavity 33b, and then the nozzle sleeve 3 is arranged on the seat sleeve 6 b; and then the fourth seal ring 26b is arranged in the fourth seal ring cavity 24b, the tenth seal ring 211b is arranged in the tenth seal ring cavity 210b, the first seal ring 29b is arranged in the first seal ring cavity 28b, and the seat sleeve 6b and the nozzle body are assembled together, so that the first water channel 23b is communicated with the third water channel 64b, and the second water channel 27b is communicated with the fourth water channel 69 b. The tail end of the needle valve 4b is inserted into the piston 5b, the needle valve 4b is fixed on the piston 5b by the nut 9b, the eighth sealing ring 52b is arranged in the eighth sealing ring cavity 51b on the piston 5b, and then the piston 5b is arranged in the cavity 61b of the seat sleeve 6b, so that the top end of the needle valve 4b penetrates through the nozzle sleeve 3b and extends into the material cavity 21b of the nozzle body 2 b. The ninth packing 76b is fitted into the ninth packing chamber 75b of the rear seat 7b, the eleventh packing 78b is fitted into the eleventh packing chamber 77b of the rear seat 7b, and the rear seat 7b is connected to the sleeve 6b so that the first flow passage 72b communicates with the second flow passage 62 b. And a second sealing ring 14b is arranged in a second sealing ring cavity 12b on the front cover 2b, a third sealing ring 15b is arranged in a third sealing ring cavity 13b on the front cover 2b, then the front cover b1 is sleeved on the nozzle body 2b, and the screw 8b sequentially penetrates through the front cover 1b, the nozzle body 2b and the seat sleeve 6b to be fixed on the rear seat 7 b.

The nozzle is fixed on a charging barrel of an injection molding machine, when injection molding is started, cooling water is introduced into the water inlet 65b, flows through the third water channel 64b and the first water channel 23b, enters the water cavity 11b, then flows through the second water channel 27b and the fourth water channel 69b, and flows out of the water outlet 66 b. When compressed gas is supplied to the first inlet port 68b, the gas enters the cavity 61b, and the piston 5b moves toward the rear seat 7b under the action of the gas pressure, and the needle valve 4b is separated from the nozzle port 22 b. The injection molding machine screw extrudes the material, and the material flows through the first flow passage 72b, the second flow passage 6b2 and the third flow passage 25b, enters the material cavity 21b, is extruded from the discharge port 22b, and enters the die. After the injection molding is completed, the compressed gas is stopped from being supplied to the first gas inlet 68b, the compressed gas is supplied to the second gas inlet 74b, the gas enters the cavity 61b, and the piston 5b moves towards the nozzle sleeve 3b under the action of the gas pressure to push the needle valve 4b to seal the discharge port 22 b. Prevent the material from flowing out of the discharge port 22b and causing drooling. The first flow channel 72b, the second flow channel 62b and the third flow channel 25b form flow channels, and more than one flow channels are arranged, preferably, the flow channels are arranged in a symmetrical manner in a double number mode, so that the material pressure is balanced, and the service life of the material nozzle is prolonged. Above scheme sets up, simple structure effectively reduces the cost of using complicated mechanical structure control needle valve, through setting up the cooling water course, especially is fit for the material that silica gel class needs low temperature to mould plastics, can show improvement injection moulding product quality.

As shown in fig. 13 to 16, the hopper 76 includes a hopper basket 761 and a drop pipe 762, the drop pipe 762 is provided with an upper mounting plate at an upper end thereof, the drop pipe 762 is provided with a lower mounting plate at a lower end thereof, the upper mounting plate is mounted to a bottom of the hopper basket 761, and the lower mounting plate is mounted to the cartridge; a heating plate 763 is arranged in the hopper basket 761, the heating plate 763 is provided with notches, the plurality of heating plates are arranged in a criss-cross mode, a cavity 7631 is arranged in the heating plate 763, the cavity 7631 penetrates through the side wall of the hopper basket 761, and a heating element (not shown) is arranged in the cavity 7631; a blanking gap 7621 and a sliding chute 7622 are arranged at the lower end of the blanking pipe 762, a discharging pipe 764 is arranged around the blanking gap, a sliding sheet 765 is arranged on the inner wall of the blanking pipe at the position corresponding to the blanking gap and the sliding chute, and a sliding rod 766 is arranged on the sliding sheet 765. The runner 7622 includes an axial runner and a radial runner; the sliding rod is provided with a large end and a small end, the small end slides along the sliding groove, and the large end slides along the outer surface of the blanking pipe; the upper part of the hopper basket is also provided with a hopper cover which plays a role of dust prevention; the lower end of the discharge pipe is provided with an anti-slip groove 7644; and an observation window 766 is arranged on the side surface of the hopper basket close to the bottom, so that the materials in the hopper basket can be observed conveniently.

According to the hopper structure, after materials enter the hopper basket, the heating elements are started, the materials in the hopper basket can be preheated through the heat of the heating elements, and the materials are uniformly heated because the plurality of heating plates which are criss-cross are arranged in the hopper basket. If need unload the material in the hopper basket, pull the slide bar upwards, the slide bar drives the gleitbretter motion, and the blanking breach is opened, and the material is unloaded from the discharge tube, and at the in-process of unloading, can be pipeline on the discharge tube usually, after having set up anti-skidding groove, pipeline is difficult to drop.

The injection molding method of the independent open-close mold injection molding machine with the disc shape comprises the following steps:

(1) more than two sets of lower dies are arranged on the rotary disc, and an upper die is arranged on at least one upper die plate.

(2) And starting the mold locking oil cylinder, wherein the mold locking oil cylinder drives the lower template, the mold locking machine column and the upper template to move, so that mold closing and mold locking are realized.

(3) Annotate the material through annotating the material device in to the mould, specific process is: adding the materials into the hopper basket, electrifying the heating plate, and preheating the materials in the hopper basket; compressed gas is introduced from the first gas inlet, the piston moves upwards under the action of the compressed gas, the piston drives the needle valve to move upwards, and the discharge hole is opened; then starting the first oil cylinder, and enabling the first cylinder body to drive the second oil cylinder, the second connecting seat, the material barrel, the screw rod and the motor to move downwards along the guide rod, so that the material nozzle is in contact with the die; starting a motor, driving a screw rod to rotate by the motor, feeding the preheated material into the charging barrel from the blanking pipe, conveying the material downwards under the action of the screw rod, starting a second oil cylinder, driving the screw rod to move downwards in a linear manner through the second oil cylinder, and extruding the material into a die from a discharge hole; in the process of injecting materials, heating is carried out through the heating ring, the temperature of the materials is measured through the temperature sensor, if the temperature is overhigh, the forced cooling is carried out through the fan, and after the fan is started, external air enters through the fan and flows out from two ends of the heat insulation cover; after the material is poured and is accomplished, let in compressed gas from the second air inlet, the piston moves down under compressed gas's effect, and the piston drives the needle valve downstream, and the discharge gate is blocked up to the needle valve.

(4) And cooling after the material injection is finished.

(5) Opening the mold; and starting the mold locking oil cylinder, driving the lower template to move upwards by the mold locking oil cylinder, driving the upper template to move upwards by the lower template through the mold locking machine column, and driving the upper mold to move upwards by the upper template to realize mold opening.

(6) And ejecting the product from the mold through an ejection mechanism.

According to the injection molding machine and the injection molding method, the mold opening and closing mechanism is independently arranged and installed on the disc fixing seat, the mold locking force is provided by the mold locking oil cylinder, the mold opening and closing of the upper mold can be independently controlled, the molds can be independently controlled, and one injection molding machine is equivalent to two or more injection molding machines; can be used for double-shot molding or producing different products; and a pair of upper dies and more than two pairs of lower dies can be used for production, so that the production efficiency is improved.

As shown in fig. 5 to 7, the working process is described in detail below by taking an example of installing a pair of upper molds on an upper mold plate 13 and two pairs of lower molds on a rotating disc 2, after the molds are installed, an oil cylinder 10 is started to push a lower mold plate 9 to descend, the lower mold plate 9 drives a mold locking machine column and an upper mold plate to descend, the molds are locked, injection molding is started, after injection molding and pressure maintaining are completed, the oil cylinder 10 is started to push the lower mold plate 9 to ascend, the lower mold plate 9 drives the mold locking machine column and the upper mold plate to ascend, the molds are opened, at this time, a driving motor 41 drives a driving gear 42 to drive the rotating disc 2 to rotate through a rack 21, the molds stop is performed after touching a turntable in-place detection switch 19, a rotation angle is set to 180 degrees, after the molds are rotated in place, the next injection molding cycle can be started, the lower molds which have been molded with products are rotated to, and taking out the product, and enabling the ejection oil cylinder to drive the ejection rod to return to prepare for next injection molding. According to the arrangement, when one pair of lower dies is used for injection molding, the other lower die is used for taking the piece, injection molding is waited after the piece taking is completed, the time of waiting for taking the piece by the die is saved, the charging barrel and the die are prevented from being cooled, the energy is saved, the time is saved, and the production efficiency is improved.

Claims (10)

1. The utility model provides a take independent open and shut mould injection molding machine of disc type which characterized in that: the automatic mould opening and closing device comprises a disc fixing seat, a rotating disc, a central rotating shaft, more than two independent mould opening and closing mechanisms and a material injection device, wherein the more than two independent mould opening and closing mechanisms and the material injection device are arranged on the disc fixing seat;

the central rotating shaft is arranged in the center of the disc fixing seat, the rotating disc is arranged on the disc fixing seat through the central rotating shaft, and the disc fixing seat is provided with a driving mechanism for driving the rotating disc; the independent mold opening and closing mechanism comprises a lower template, a mold locking oil cylinder, an upper template and more than two mold locking machine columns, wherein the lower template is arranged at the lower ends of the mold locking machine columns, the mold locking oil cylinder is connected with the lower template, and the upper template is arranged at the upper ends of the mold locking machine columns;

the disc fixing seat is provided with an ejection mechanism, the ejection mechanism comprises more than two guide rods arranged on the disc fixing seat, the lower ends of the guide rods are provided with ejection oil cylinders, the guide rods are provided with sliding plates in a sliding manner, and the sliding plates are provided with more than two ejector rods; a rod body is arranged on the rack, two sliding lantern rings are arranged on the rod body, a locking mechanism is arranged on each lantern ring, and a position sensor is arranged on each lantern ring;

each upper template is provided with a material injection device; the material injection device comprises a first oil cylinder, a second oil cylinder, a motor, a guide rod, a charging barrel assembly and a hopper; the two first oil cylinders comprise first cylinder bodies and first piston rods, the upper ends of the first piston rods are arranged in the first cylinder bodies, the lower ends of the first piston rods are fixed on the upper template, and first connecting seats are arranged between the first cylinder bodies; the number of the second oil cylinders is two, each second oil cylinder comprises a second cylinder body and a second piston rod, the upper end of each second piston rod is arranged in the corresponding second cylinder body, the lower end of each second piston rod is fixed on the corresponding first cylinder body, and a second connecting seat is arranged between the corresponding second cylinder bodies; the motor is arranged on the second connecting seat; the guide rod is arranged on the upper template, a first guide seat is arranged on the first cylinder body, a second guide seat is arranged on the second cylinder body, and the guide rod penetrates through the first guide seat and the second guide seat in a sliding manner;

the charging barrel component comprises a charging barrel, a screw, a charging nozzle seat and a charging nozzle; the charging barrel is fixed on the first connecting seat, the charging barrel is arranged outside the screw rod, and the screw rod penetrates through the first connecting seat and is connected to an output shaft of the motor; the material nozzle base is arranged at one end of the charging barrel, and the material nozzle is arranged on the material nozzle base; more than two heating rings are sleeved outside the charging barrel, gaps are reserved between adjacent heating rings, and temperature sensors are arranged on the heating rings and the charging barrel; a heat insulation cover is arranged outside the heating ring, the end face of the heat insulation cover is an opening, a cavity is formed between the heat insulation cover and the heating ring, and a fan corresponding to the heating ring is arranged on the heat insulation cover;

the material nozzle comprises a material nozzle body, a seat sleeve, a rear seat and a needle valve, the rear seat is connected to one end of the material cylinder, a material cavity and a discharge hole are formed in the material nozzle body, the material nozzle body is arranged at one end of the seat sleeve, the rear seat is arranged at the other end of the seat sleeve, a nozzle sleeve is arranged at one end, connected with the material nozzle body, in the seat sleeve, a cavity is formed by the nozzle sleeve, a piston is arranged in the cavity, the needle valve is fixed on the piston, the needle valve penetrates through the nozzle sleeve and is inserted into the material cavity, a first air passage and a first air inlet communicated with the first air passage are arranged on the seat sleeve, the first air passage is communicated with the cavity, a second air passage and a second air inlet communicated with the second air passage are arranged on the rear seat or the seat sleeve, the second air passage is communicated with the cavity, the second air passage is arranged on the other side of the piston, a first flow passage is arranged on the rear seat sleeve, a third, the first flow channel, the second flow channel and the third flow channel are communicated, the third flow channel is communicated with the material cavity, the first flow channel, the second flow channel and the third flow channel form a flow channel, and more than one flow channel is arranged;

the hopper comprises a hopper basket and a blanking pipe, the upper end of the blanking pipe is connected with the lower end of the hopper basket, and the lower end of the blanking pipe is connected with the charging barrel; a heating plate is arranged in the hopper basket, the heating plate is provided with a notch, a plurality of heating plates are arranged in a criss-cross mode, a cavity is arranged in the heating plate, the cavity penetrates through the side wall of the hopper basket, and a heating element is arranged in the cavity; the blanking device is characterized in that a blanking notch and a sliding groove are formed in the lower end of the blanking pipe, the discharging pipe is arranged around the blanking notch, a sliding piece is arranged at the position, corresponding to the blanking notch and the sliding groove, of the inner wall of the blanking pipe, and a sliding rod is arranged on the sliding piece.

2. The independent split-mold injection molding machine of the type with a circular disk according to claim 1, characterized in that: the outer circumference of the rotary disc is provided with a rack, the driving mechanism comprises a driving motor and a driving gear, the driving motor is fixed on the disc fixing seat, the driving gear is connected with a motor output shaft, and the driving gear is meshed with the rack.

3. The independent split-mold injection molding machine of the type with a circular disk according to claim 1, characterized in that: the center of the rotating disc is provided with a rolling bearing, the rolling bearing is fixed on the rotating disc through a bearing fixing seat, and the rolling bearing is matched with the central rotating shaft; one of the mould locking machine columns of each independent mould opening and closing mechanism penetrates through the central rotating shaft, and a sliding bearing is arranged between the mould locking machine column penetrating through the central rotating shaft and the central rotating shaft.

4. The independent split-mold injection molding machine of the type with a circular disk according to claim 1, characterized in that: a sliding device is arranged between the disc fixing seat and the rotating disc; the sliding device is a copper block; and a turntable in-place detection switch is arranged on the rotating disc.

5. The independent split-mold injection molding machine of the type with a circular disk according to claim 1, characterized in that: the locking mechanism is a locking screw, and the locking screw acting with the rod body is arranged on the lantern ring.

6. The independent split-mold injection molding machine of the type with a circular disk according to claim 1, characterized in that: 8 heating rings are arranged, and 8 fans are arranged; one end of the charging barrel, which is far away from the charging nozzle, is sleeved with a cooling ring.

7. The independent split-mold injection molding machine of the type with a circular disk according to claim 1, characterized in that: a front cover is arranged at one end, close to the discharge port, of the material nozzle body, a first water channel and a second water channel are arranged in the material nozzle body, a water cavity is arranged between the front cover and the material nozzle body, a third water channel, a fourth water channel, a water inlet and a water outlet are arranged on the seat sleeve, the water inlet, the third water channel and the first water channel are communicated, and the first water channel is communicated with the water cavity; the second water channel and the fourth water channel are communicated with the water outlet, and the second water channel is communicated with the water cavity.

8. The independent split-mold injection molding machine of the type with a circular disk according to claim 1, characterized in that: the front end of the needle valve is conical, the tail end of the needle valve is provided with threads, the threads are provided with nuts, and the needle valve is fixed on the piston through the nuts.

9. The independent split-mold injection molding machine of the type with a circular disk according to claim 1, characterized in that: the upper end of the blanking pipe is provided with an upper mounting plate, and the lower end of the blanking pipe is provided with a lower mounting plate; the sliding grooves comprise axial sliding grooves and radial sliding grooves; the sliding rod is provided with a large end and a small end, the small end slides along the sliding groove, and the large end slides along the outer surface of the blanking pipe; a hopper cover is also arranged at the upper part of the hopper basket; the lower end of the discharge pipe is provided with an anti-skid groove; and an observation window is arranged on the side surface of the hopper basket close to the bottom.

10. An injection molding method of a separate split mold injection molding machine of a disc type according to claim 1, characterized in that:

(1) more than two sets of lower dies are arranged on the rotary disc, and an upper die is arranged on at least one upper die plate;

(2) starting a mold locking oil cylinder, wherein the mold locking oil cylinder drives a lower template, a mold locking machine column and an upper template to move, so that mold closing and mold locking are realized;

(3) annotate the material through annotating the material device in to the mould, specific process is: adding the materials into the hopper basket, electrifying the heating plate, and preheating the materials in the hopper basket; compressed gas is introduced from the first gas inlet, the piston moves upwards under the action of the compressed gas, the piston drives the needle valve to move upwards, and the discharge hole is opened; then starting the first oil cylinder, and enabling the first cylinder body to drive the second oil cylinder, the second connecting seat, the material barrel, the screw rod and the motor to move downwards along the guide rod, so that the material nozzle is in contact with the die; starting a motor, driving a screw rod to rotate by the motor, feeding the preheated material into the charging barrel from the blanking pipe, conveying the material downwards under the action of the screw rod, starting a second oil cylinder, driving the screw rod to move downwards in a linear manner through the second oil cylinder, and extruding the material into a die from a discharge hole; in the process of injecting materials, heating is carried out through the heating ring, the temperature of the materials is measured through the temperature sensor, if the temperature is overhigh, the forced cooling is carried out through the fan, and after the fan is started, external air enters through the fan and flows out from two ends of the heat insulation cover; after the materials are injected, compressed gas is introduced from the second gas inlet, the piston moves downwards under the action of the compressed gas, the piston drives the needle valve to move downwards, and the needle valve blocks the discharge hole;

(4) cooling after the material injection is finished;

(5) opening the mold; starting a mold locking oil cylinder, driving a lower template to move upwards by the mold locking oil cylinder, driving an upper template to move upwards by the lower template through a mold locking machine column, and driving an upper mold to move upwards by the upper template to realize mold opening;

(6) and ejecting the product from the mold through an ejection mechanism.