CN115157542B - Injection molding device and process for daily plastic products capable of eliminating silver mark defects of injection molding parts - Google Patents

Abstract

The invention is suitable for the technical field of injection molding, and provides a daily plastic product injection molding device capable of eliminating the silver pattern defect of an injection molding part, which comprises the following components: the machining device comprises a main case, a machining table is arranged in the main case, a lower die is mounted on the machining table, and a jacking opening is formed in the lower die; the control cylinder is mounted on the inner wall of the mainframe box, a main power supply is arranged in the control cylinder and is in circuit connection with the control cylinder, an air pressure rod is arranged in the control cylinder, and an upper die is mounted at one end of the air pressure rod; the automatic demolding assembly is arranged inside the processing table; the device can automatically realize demoulding operation on the injection molding finished product by adding the automatic demoulding component, has good demoulding effect and avoids damaging the injection molding finished product; the jacking opening is opened firstly by utilizing the difference of the rotation resistance, and then the jacking demoulding operation is carried out, so that the device has good linkage effect and stable operation.

Description

Injection molding device and process for daily plastic products capable of eliminating silver mark defects of injection molding parts

Technical Field

The invention belongs to the technical field of injection molding, and particularly relates to an injection molding device and process for a daily plastic product capable of eliminating the silver mark defect of an injection molding part.

Background

Injection molding, also known as injection molding, is a method of molding by injection and molding. The injection molding method has the advantages of high production speed, high efficiency, automation of operation, various colors, various shapes from simple to complex, small sizes, precise product size, easy replacement of products, capability of forming products with complex shapes, and suitability for the molding processing field of mass production of daily plastic products and the like.

However, after the injection molding of the present injection molding device for daily plastic products, manual demolding needs to be performed through various instruments, which is a complicated operation, and on the other hand, in the demolding process, because the finished product of the daily plastic product just molded is still in a high temperature state, forced demolding may cause damage to the finished product of the daily plastic product and affect the yield, and in addition, in the high temperature state of the finished product of the daily plastic product just molded in the injection molding process, moisture mixed in the injection molding raw material easily causes the silver defect of the daily plastic product and affects the quality of the daily plastic product.

Disclosure of Invention

The embodiment of the invention aims to provide a daily plastic product injection molding device capable of eliminating the silver mark defect of an injection molding part, and aims to solve the problems that the conventional injection molding device needs to be manually demolded through various instruments after injection molding is finished, and the mode is very complicated to operate on one hand, and on the other hand, in the demolding process, because a finished product which is just molded is still in a high-temperature state, forced demolding can possibly cause damage to the finished product, and the yield is influenced.

The embodiment of the invention is realized in such a way, and the injection molding device for the daily plastic products capable of eliminating the silver mark defect of the injection molding part comprises: the machining device comprises a main case, a machining table is arranged in the main case, a lower die is mounted on the machining table, and a jacking opening is formed in the lower die; the control cylinder is arranged on the inner wall of the mainframe box, a main power supply is arranged in the control cylinder and is in circuit connection with the control cylinder, an air pressure rod is arranged in the control cylinder, and an upper die is arranged at one end of the air pressure rod; the automatic demolding assembly is arranged inside the processing table; wherein the automatic demolding assembly comprises: the opening assembly is arranged in the processing table and is matched with the lower die; the driving assembly is arranged in the main case and is matched with the upper die and the opening assembly; and the jacking assembly is arranged inside the processing table and is matched with the opening assembly.

Preferably, the opening assembly includes: the first support column is arranged on the inner wall of the processing table, and one end of the first support column is rotatably connected with a first rotating shaft; the first gear is arranged at one end of the first rotating shaft, and a first rotating disc is arranged on the first gear; the second supporting column is arranged on the inner wall of the processing table, a second gear is rotatably connected onto the second supporting column, a second turntable is arranged on the second gear, and a conveying belt is arranged between the first turntable and the second turntable; the sliding groove is arranged in the machining table, a sliding block is arranged in the sliding groove, and a guide column is arranged on the sliding block; the first toothed plate is sleeved on the guide post in a sliding manner and is matched with the first gear; the second toothed plate is installed on the first toothed plate and matched with the second gear, the supporting plate is installed at one end of the second toothed plate, and the supporting plate is matched with the jacking opening.

Preferably, the length of the guide post is not less than the width of the jacking opening, and the length and width of the outer edge of the support plate are equal to the length and width of the inner edge of the jacking opening.

Preferably, the driving assembly includes: the third supporting column is arranged on the processing table and is rotatably connected with a second rotating shaft; the output motor is arranged at one end of the second rotating shaft, and the output end of the output motor is connected with one end, far away from the first gear, of the first rotating shaft; the power receiving plate is arranged on the inner wall of the mainframe box and is connected with an input end line of the output motor; the current conducting plate is installed go up mould one side, the input of current conducting plate with total power supply circuit connects, the current conducting plate with the electricity board is mutually supported.

Preferably, the rotating force required by the rotating connection position of the second rotating shaft and the third supporting column when rotating is larger than the rotating force required by the rotating connection position of the first rotating shaft and the first supporting column when rotating.

Preferably, the jacking assembly comprises: the fourth supporting column is arranged on the processing table, one end of the fourth supporting column is rotatably connected with a transmission gear, and a transmission gear chain is sleeved between the transmission gears in a matching manner; the third gear is arranged on the second rotating shaft and is matched with the transmission gear chain; the connecting block is arranged on the transmission toothed chain, a guide upright post is arranged on the connecting block, and a guide groove is formed in the guide upright post; the jacking rod is arranged inside the guide groove, and a first spring is arranged between one end of the jacking rod and the inner wall of the guide groove.

Preferably, one end of the jacking rod, which is positioned outside the guide groove, is rotatably connected with a pushing wheel.

Preferably, the reset assembly comprises: the reverse conducting plate is arranged on one side of the upper die and is connected with the main power circuit, and the reverse conducting plate is matched with the power connection plate; the reset block is installed on the transmission toothed chain, a second spring is installed on one side of the reset block, and one end of the second spring is connected with the inner wall of the machining table.

Preferably, the inside cooler bin that is equipped with of mainframe box, the inside coolant liquid that is equipped with of cooler bin, the cooling block is installed to the bed die lateral part, install inlet tube and outlet pipe on the cooling block, inlet tube and outlet pipe are connected with the cooler bin, the inlet tube is equipped with the pump body with the cooler bin junction.

The invention also provides a molding process of the daily plastic product injection molding device capable of eliminating the silver mark defect of the injection molding part, which comprises the following steps:

s1, preparing injection molding raw materials: the injection molding base material and the silver mark defect improver are mixed according to the weight ratio (8-10): 1, mixing, smelting at 160-210 ℃ for 10-20min, extruding in a double-screw extruder at 150-170 ℃ for 5-10min, and cooling to room temperature to obtain an injection molding raw material;

s2, injection molding treatment: performing injection molding on the injection molding raw material through an upper mold and a lower mold in an injection molding device;

s3, demolding treatment: after the injection molding is finished, starting a main power supply, driving and controlling the cylinder to ascend, and separating the upper die from the lower die; in the process of moving the upper die, the driving assembly can be operated, the opening assembly is driven to enable the jacking opening to be opened, meanwhile, the jacking assembly can be operated under the driving of the opening assembly to jack up the injection molding finished product attached to the lower die, so that the automatic demolding effect is realized, the upper die is continuously lifted, the driving assembly is reversely operated in the lifting process to drive the reset assembly to operate, the automatic demolding assembly is reset, and the next injection molding is waited.

Preferably, the preparation method of the crazing defect improver comprises the following steps:

step one, modifying bentonite: feeding bentonite into a calcining furnace for calcining at the calcining temperature of 300-500 ℃ for 30-40min, finishing calcining, then placing the calcined bentonite into a sodium alginate solution with the mass fraction of 30-50% for ultrasonic reaction for 10-20min, wherein the ultrasonic power is 200-300W, finishing ultrasonic treatment, washing with water, and drying to obtain modified bentonite;

step two, grafting bentonite: feeding the modified bentonite into a silane coupling agent KH560 for distillation treatment, wherein the distillation temperature is 100-200 ℃, the distillation time is 10-20min, after the distillation is finished, washing and drying the modified bentonite, then feeding the modified bentonite into a maleic anhydride solution for stirring reaction for 10-20min, wherein the stirring temperature is 90-100 ℃, the stirring speed is 300-500r/min, and after the stirring is finished, obtaining grafted bentonite; wherein the maleic anhydride solution is maleic anhydride, and the mass fraction of the hydrochloric acid dopamine solution is 10-20% according to the weight ratio of 1:3, mixing to obtain the finished product;

step three, preparing the silver streak defect improver: mixing gum arabic with a modifying material according to a weight ratio of 3:1, mixing at the mixing speed of 100-200r/min, at the mixing temperature of 90-150 ℃ for 20-30min to obtain modified resin, and mixing with the grafted bentonite according to the weight ratio of 3:1, feeding the mixture into a reaction furnace for reaction, wherein the reaction speed is 150-250r/min, the reaction temperature is 130-140 ℃, the reaction time is 40-50min, and the silver streak defect improver is obtained after the reaction is finished, wherein the modified material is prepared from melamine and paraformaldehyde according to the weight ratio of 1:3, then adding deionized water and sodium hydroxide, heating to 75 ℃, reacting for 10min, then adding terephthalaldehyde, and continuing to react for 5min to obtain the composite.

The daily plastic product injection molding device capable of eliminating the silver mark defect of the injection molding part, provided by the embodiment of the invention, has the following beneficial effects:

1. according to the device, the automatic demoulding assembly is additionally arranged, so that demoulding operation can be automatically realized on the injection molding finished product when the upper mould and the lower mould are separated from each other, convenience and rapidness are realized, manual demoulding is not needed, the demoulding effect is good, and the injection molding finished product is prevented from being damaged;

2. the operation of opening the jacking opening and then jacking and demoulding is realized by utilizing the difference of the rotation resistance, the device has good linkage effect and stable operation;

3. through modification of injection molding raw materials, the injection molding raw materials are matched with an additional automatic demolding assembly in injection molding, so that injection molding efficiency is improved, and a silver line defect modification effect is improved; the inventive points are as follows: the crazing defect modifier is modified by bentonite, the dispersion degree of the crazing defect modifier and the spacing of sheet layers are improved by calcining and sodium alginate dispersing during modification, and the aim is to modify an injection molding base material and improve the shrinkage degree of a raw material product.

Drawings

FIG. 1 is a schematic structural diagram of a daily plastic product injection molding device capable of eliminating the silver mark defect of an injection molding part according to an embodiment of the invention;

FIG. 2 is a working state diagram of a domestic plastic product injection molding device capable of eliminating silver mark defects of injection parts, provided by the embodiment of the invention;

FIG. 3 is a partial perspective view of a driving device in an injection molding device for daily-use plastic products capable of eliminating the silver streak defect of injection molded parts, according to an embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

FIG. 5 is an enlarged view of a portion of FIG. 1 at B;

FIG. 6 is an enlarged view of a portion of FIG. 2 at C;

fig. 7 is a partial enlarged view of fig. 2 at D.

In the drawings: 1-a main chassis; 2-a processing table; 3-lower mould; 4-jacking up the opening; 5-controlling the cylinder; 6-total power supply; 7-pneumatic rod; 8, mounting a mold; 9-an automatic demolding assembly; 91-a first support column; 92-a first shaft; 93-a first gear; 94-a first carousel; 95-a second support column; 96-a second gear; 97-a second carousel; 98-conveying belt; 99-a sliding groove; 910-a slider; 911-guide post; 912-a first toothed plate; 913-second toothed plate; 914-a support plate; 915-third support column; 916-a second rotating shaft; 917-an output motor; 918-a power strip; 919-a conductive plate; 920-a fourth support column; 921-driving gear; 922-a drive sprocket; 923-a third gear; 924-a connecting block; 925-guiding upright post; 926-a guide slot; 927-jack-up rod; 928-first spring; 929-push wheel; 930-reverse conducting plate; 931-reset block; 932-a second spring; 10-a cooling box; 11-a cooling block; 12-a water inlet pipe; 13-water outlet pipe; 14-pump body.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Specific implementations of the present invention are described in detail below with reference to specific embodiments.

Example 1

In the embodiment of the invention, as shown in fig. 1 and fig. 2, the injection molding device for the daily plastic product capable of eliminating the silver mark defect of the injection molding part comprises: the device comprises a main case 1, wherein a processing table 2 is arranged inside the main case 1, a lower die 3 is arranged on the processing table 2, and a jacking opening 4 is formed in the lower die 3; the control cylinder 5 is installed on the inner wall of the mainframe box 1, a main power supply 6 is arranged inside the control cylinder 5, the main power supply 6 is in circuit connection with the control cylinder 5, a pressure rod 7 is arranged inside the control cylinder 5, and an upper die 8 is installed at one end of the pressure rod 7; an automatic demoulding component 9 which is arranged inside the processing table 2; wherein the automatic demolding assembly 9 comprises: an opening assembly installed inside the processing table 2 and cooperating with the lower mold 3; the driving assembly is arranged inside the main case 1 and is matched with the upper die 8 and the opening assembly; and the jacking assembly is arranged inside the processing table 2 and is matched with the opening assembly.

When this can eliminate daily plastic products injection moulding device of injection molding silver line defect uses, treat injection moulding back, start total power 6, then total power 6 can drive control cylinder 5 and rise, make upper mold 8 and bed die 3 break away from each other, and simultaneously, at the in-process of upper mold 8 motion, can make drive assembly operate, and drive opening assembly and make jack-up mouth 4 opened, jack-up subassembly can operate under opening assembly's drive simultaneously, will adhere to injection moulding finished product jack-up on bed die 3, make it realize the effect of automatic drawing of patterns, continue to make upper mold 8 rise afterwards, then can give drive assembly reverse operation power at the in-process that rises, drive reset assembly operation, make automatic drawing of patterns subassembly 9 reset, wait for the next time to mould plastics.

As shown in fig. 1 to 5, in an embodiment of the present invention, the opening assembly includes: a first support column 91 mounted on the inner wall of the processing table 2, wherein one end of the first support column 91 is rotatably connected with a first rotating shaft 92; a first gear 93 mounted on one end of the first shaft 92, the first gear 93 having a first rotary plate 94 mounted thereon; the second supporting column 95 is installed on the inner wall of the processing table 2, a second gear 96 is rotatably connected to the second supporting column 95, a second turntable 97 is installed on the second gear 96, and a conveying belt 98 is arranged between the first turntable 94 and the second turntable 97; a slide groove 99 provided inside the machining table 2, a slide block 910 being provided inside the slide groove 99, the slide block 910 being provided with a guide post 911; the first toothed plate 912 is sleeved on the guide post 911 in a sliding manner, and the first toothed plate 912 is matched with the first gear 93; second pinion rack 913, install on first pinion rack 912, second pinion rack 913 and second gear 96 mutually support, backup pad 914 is installed to second pinion rack 913 one end, backup pad 914 and jack-up mouth 4 mutually support.

During the use, drive assembly can drive first pivot 92 rotatory, and then drive first gear 93 is rotatory, then first gear 93 can make second gear 96 rotatory through first carousel 94 and second carousel 97 and transmission band 98, as shown in fig. 5, second gear 96 can drive backup pad 914 through second pinion rack 913 and descend, until first pinion rack 912 and first gear 93 mesh, then the rotation of first gear 93 can drive first pinion rack 912 and move to both sides, make backup pad 914 break away from jack-up mouth 4 completely, make jack-up mouth 4 opened.

In the embodiment of the invention, the length of the guide post 911 is not less than the width of the jacking port 4, and the length and width of the outer edge of the support plate 914 are equal to the length and width of the inner edge of the jacking port 4, so that the support plate 914 is ensured to be tightly attached to the inner wall of the jacking port 4, and the injection molding raw materials are prevented from flowing out through a contact gap in the injection molding process to influence the injection molding effect.

As shown in fig. 1 to 6, in an embodiment of the present invention, the driving assembly includes: a third supporting column 915 which is arranged on the processing table 2, wherein a second rotating shaft 916 is rotatably connected to the third supporting column 915; an output motor 917 installed at one end of the second rotating shaft 916, wherein an output end of the output motor 917 is connected to one end of the first rotating shaft 92 away from the first gear 93; a power receiving plate 918 installed on the inner wall of the main cabinet 1, wherein the power receiving plate 918 is connected with an input end line of the output motor 917; and a conductive plate 919 installed at one side of the upper mold 8, an input end of the conductive plate 919 being electrically connected to the main power supply 6, the conductive plate 919 being fitted to the power connection plate 918.

During use, in the process that the upper mold 8 rises, the conductive plate 919 is in contact with the power receiving plate 918, the movement of the upper mold 8 is suspended, the power receiving plate 918 drives the output motor 917 to operate, the first rotating shaft 92 is driven to rotate, the operation of the shedding assembly is controlled, when the first toothed plate 912 moves to the most lateral part under the driving of the first gear 93, the first toothed plate 912 cannot move at the moment, the first gear 93 cannot rotate, the power of the output motor 917 drives the first toothed plate to rotate at the moment, and the second rotating shaft 916 is driven to rotate, so that the operation of the jacking assembly is controlled.

In the embodiment of the present invention, the rotational force required by the rotational connection between the second rotating shaft 916 and the third supporting column 915 is greater than the rotational force required by the rotational connection between the first rotating shaft 92 and the first supporting column 91, so as to ensure that the output motor 917 does not rotate in advance, and to define the operation sequence of the device.

As shown in fig. 1 to 6, in an embodiment of the present invention, the jacking assembly includes: the fourth supporting column 920 is installed on the processing table 2, one end of the fourth supporting column 920 is rotatably connected with a transmission gear 921, and a transmission toothed chain 922 is sleeved between the transmission gears 921 in a matching manner; a third gear 923 mounted on the second shaft 916, wherein the third gear 923 is engaged with the transmission gear 922; the connecting block 924 is mounted on the transmission toothed chain 922, a guide upright post 925 is mounted on the connecting block 924, and a guide groove 926 is formed in the guide upright post 925; the jack-up rod 927 is arranged in the guide groove 926, and a first spring 928 is arranged between one end of the jack-up rod 927 and the inner wall of the guide groove 926.

When in use, when the jacking port 4 is in an open state, the jacking rod 927 can be upwards bounced under the pushing action of the first spring 928 because the jacking rod is not blocked by the supporting plate 914, and an injection molding finished product in the middle is pushed up to carry out primary demolding; when the second rotating shaft 916 starts rotating, the third gear 923 is driven to rotate, and then the transmission toothed chain 922 starts transmission to drive the guide upright post 925 to start moving, and then the injection molding finished product attached to the lower mold 3 is gradually pushed up completely by jacking the rod 927, so that the effect of complete demolding is realized.

In the embodiment of the present invention, a pushing wheel 929 is rotatably connected to one end of the lifting rod 927, which is located outside the guide groove 926, and the pushing wheel 929 can make the contact between the lifting rod and the injection-molded product smoother, so as to prevent the injection-molded product from being damaged.

As shown in fig. 1 to 6, in an embodiment of the present invention, the reset assembly includes: a reverse conductive plate 930 disposed at one side of the upper mold 8 and electrically connected to the main power supply 6, the reverse conductive plate 930 being engaged with the power receiving plate 918; and a reset block 931 mounted on the transmission toothed chain 922, wherein a second spring 932 is mounted on one side of the reset block 931, and one end of the second spring 932 is connected with the inner wall of the processing table 2.

When the device is used, after the demolding is finished, the upper mold 8 is continuously lifted upwards, the electric connection plate 918 is separated from the electric conduction plate 919 firstly, the output motor 917 loses power, the transmission toothed chain 922 resets under the action of the tension of the second spring 932, the jacking rod 927 is driven to reset, and the jacking rod 927 can be manually pressed downwards; the conducting plate 918 contacts with the reverse conducting plate 930 to rotate the output motor 917 in a reverse direction, so as to drive the first gear 93 and the second gear 96 to rotate in a reverse direction, thereby resetting the supporting plate 914.

As shown in fig. 1, fig. 2 and fig. 6, in the embodiment of the present invention, a cooling tank 10 is disposed inside the main cabinet 1, cooling liquid is disposed inside the cooling tank 10, a cooling block 11 is mounted on a side portion of the lower mold 3, a water inlet pipe 12 and a water outlet pipe 13 are mounted on the cooling block 11, the water inlet pipe 12 and the water outlet pipe 13 are connected to the cooling tank 10, and a pump body 14 is disposed at a connection portion of the water inlet pipe 12 and the cooling tank 10.

In the process of moulding plastics, need constantly cool off the cooling, make the injection molding shaping, then pump body 14 can constantly follow the inside coolant liquid that extracts of cooling tank 10 to pour into cooling block 11 with it into, and inlet tube 12 and outlet pipe 13 set up and can make the inside coolant liquid of cooling block 11 be in the mobile state all the time, strengthen the cooling effect.

In conclusion, when the daily plastic product injection molding device capable of eliminating the silver pattern defect of the injection molding part is used, after injection molding, the main power supply 6 is started, the main power supply 6 can drive the control cylinder 5 to ascend, so that the upper mold 8 and the lower mold 3 are separated from each other, meanwhile, in the process of movement of the upper mold 8, the driving assembly can be operated, the opening assembly is driven to open the jacking opening 4, meanwhile, the jacking assembly can be operated under the driving of the opening assembly to jack up the injection molding finished product attached to the lower mold 3, so that the automatic demolding effect is realized, then, the upper mold 8 is continuously ascended, the driving assembly is given reverse operation power in the ascending process to drive the reset assembly to operate, so that the automatic demolding assembly 9 can reset to wait for next injection molding.

Example 2

On the basis of the embodiment 1, the molding process of the injection molding device for the daily plastic product capable of eliminating the silver mark defect of the injection molding part comprises the following steps:

s1, preparing injection molding raw materials: and (3) mixing the injection molding base material with the silver mark defect improver according to the weight ratio of 8:1, mixing, smelting at 160 ℃ for 10min, then sending into a double-screw extruder for extrusion at 150 ℃ for 5min, and cooling to natural room temperature after the extrusion is finished to obtain an injection molding raw material;

s2, injection molding treatment: performing injection molding on the injection molding raw material through an upper die 8 and a lower die 3 in an injection molding device;

s3, demolding treatment: after the injection molding is finished, starting a main power supply 6, driving and controlling the cylinder 5 to ascend, and separating the upper die 8 and the lower die 3 from each other; in the process of 8 movements of last mould, can make drive assembly operation to drive opening assembly and make jack-up mouth 4 opened, jack-up assembly can operate under opening assembly's drive simultaneously, will adhere to injection moulding finished product jack-up on lower mould 3, make its effect that realizes automatic drawing of patterns, continue to make mould 8 rise afterwards, then can give drive assembly reverse operation power at the in-process that rises, drive the operation of subassembly that resets, make automatic drawing of patterns subassembly reset, wait for next time to mould plastics.

The preparation method of the silver streak defect improver comprises the following steps:

step one, modifying bentonite: feeding the modified bentonite into a calcining furnace for calcining at 300 ℃ for 30min, then placing the calcined bentonite into a sodium alginate solution with the mass fraction of 30% for ultrasonic reaction for 10min, wherein the ultrasonic power is 200W, and after ultrasonic reaction, washing and drying to obtain the modified bentonite;

step two, grafting bentonite: distilling bentonite in silane coupling agent KH560 at 100 deg.C for 10min, washing with water, drying, adding into maleic anhydride solution, stirring at 90 deg.C for 10min at 300r/min, and stirring to obtain grafted bentonite; wherein the maleic anhydride solution is maleic anhydride, and the mass fraction of the hydrochloric acid dopamine solution is 10%, and the weight ratio is 1:3, mixing to obtain the finished product;

step three, preparing the silver streak defect improver: mixing gum arabic with a modifying material according to a weight ratio of 3:1, mixing at the mixing speed of 100r/min and the mixing temperature of 90 ℃ for 20min to obtain modified resin, and mixing with the grafted bentonite according to the weight ratio of 3:1, feeding the mixture into a reaction furnace for reaction, wherein the reaction speed is 150r/min, the reaction temperature is 130 ℃, the reaction time is 40min, and after the reaction is finished, the silver streak defect improver is obtained, wherein the modified material is prepared from melamine and paraformaldehyde according to the weight ratio of 1:3, then adding deionized water and sodium hydroxide, heating to 75 ℃, reacting for 10min, then adding terephthalaldehyde, and continuing to react for 5min to obtain the composite.

Example 3

On the basis of embodiment 1, the molding process of the injection molding device for daily plastic products capable of eliminating the silver mark defect of the injection molding part comprises the following steps:

s1, preparing injection molding raw materials: and (3) mixing the injection molding base material with the silver mark defect improver according to the weight ratio of 9:1, mixing, smelting at 190 ℃ for 15min, then feeding into a double-screw extruder for extrusion at 160 ℃ for 7.5min, and cooling to natural room temperature to obtain an injection molding raw material after the extrusion is finished;

s2, injection molding treatment: performing injection molding on the injection molding raw material through an upper die 8 and a lower die 3 in an injection molding device;

s3, demolding treatment: after the injection molding is finished, starting a main power supply 6, driving and controlling the cylinder 5 to ascend, and separating the upper die 8 and the lower die 3 from each other; in the process of 8 movements of last mould, can make drive assembly operation to drive opening assembly and make jack-up mouth 4 opened, jack-up assembly can operate under opening assembly's drive simultaneously, will adhere to injection moulding finished product jack-up on lower mould 3, make its effect that realizes automatic drawing of patterns, continue to make mould 8 rise afterwards, then can give drive assembly reverse operation power at the in-process that rises, drive the operation of subassembly that resets, make automatic drawing of patterns subassembly reset, wait for next time to mould plastics.

The preparation method of the crazing defect improver comprises the following steps:

step one, modifying bentonite: feeding bentonite into a calcining furnace for calcining, wherein the calcining temperature is 400 ℃, the calcining time is 35min, after calcining, placing the calcined bentonite into a sodium alginate solution with the mass fraction of 40%, performing ultrasonic reaction for 15min, the ultrasonic power is 250W, after ultrasonic reaction, washing and drying to obtain modified bentonite;

step two, grafting bentonite: feeding the modified bentonite into a silane coupling agent KH560 for distillation treatment, wherein the distillation temperature is 150 ℃, the distillation time is 15min, after the distillation is finished, washing and drying the modified bentonite, then feeding the modified bentonite into a maleic anhydride solution for stirring reaction for 15min, wherein the stirring temperature is 95 ℃, the stirring speed is 400r/min, and after the stirring is finished, obtaining grafted bentonite; wherein the maleic anhydride solution is maleic anhydride, and the mass fraction of the hydrochloric acid dopamine solution is 15%, and the weight ratio is 1:3, mixing to obtain the finished product;

step three, preparing the silver streak defect improver: mixing gum arabic with a modifying material according to a weight ratio of 3:1, mixing at the mixing speed of 150r/min, the mixing temperature of 120 ℃ for 25min to obtain modified resin, and mixing with the grafted bentonite according to the weight ratio of 3:1, feeding the mixture into a reaction furnace for reaction, wherein the reaction speed is 200r/min, the reaction temperature is 135 ℃, the reaction time is 40-50min, and the silver streak defect improver is obtained after the reaction is finished, wherein the modified material is prepared from melamine and paraformaldehyde according to the weight ratio of 1:3, then adding deionized water and sodium hydroxide, heating to 75 ℃, reacting for 10min, then adding terephthalaldehyde, and continuing to react for 5min to obtain the composite.

Comparative example 1

The only difference from example 3 is that no modifier was added to the modified resin.

Comparative example 2

A plastic base stock prepared in the market of Enterprise trusted plastics Co., ltd, dongguan was used, and the same plastic base stock as in example 3 was used except that the craze defect improver was not added.

And (3) testing the silver streak defect rate, wherein 1000 pieces of plastic base materials are selected for injection molding, whether the formed product has the silver streak defect is observed, and the silver streak defect rate refers to the product/all product quantity with the silver streak defect

The experimental examples 1-3 and the comparative examples 1-2 show that the product of the invention has strong shrinkage, low porosity and low silver mark defect rate.

The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (7)

1. Can eliminate daily plastic products injection moulding device of injection molding silver line defect, its characterized in that includes: the machining device comprises a main case, a machining table is arranged in the main case, a lower die is mounted on the machining table, and a jacking opening is formed in the lower die; the control cylinder is mounted on the inner wall of the mainframe box, a main power supply is arranged in the control cylinder and is in circuit connection with the control cylinder, an air pressure rod is arranged in the control cylinder, and an upper die is mounted at one end of the air pressure rod; the automatic demolding assembly is arranged inside the processing table; wherein the automatic demolding assembly comprises: the opening assembly is arranged in the processing table and is matched with the lower die; the driving assembly is arranged in the main case and is matched with the upper die and the opening assembly; the jacking assembly is arranged inside the processing table and is matched with the opening assembly; the resetting assembly is arranged in the processing table and is matched with the driving assembly; wherein the jacking assembly comprises: the fourth supporting column is arranged on the processing table, one end of the fourth supporting column is rotatably connected with a transmission gear, and a transmission gear chain is sleeved between the transmission gears in a matching manner; the third gear is arranged on the driving assembly and is matched with the transmission gear chain; the connecting block is arranged on the transmission toothed chain, a guide upright post is arranged on the connecting block, and a guide groove is formed in the guide upright post; the jacking rod is arranged in the guide groove, and a first spring is arranged between one end of the jacking rod and the inner wall of the guide groove; one end of the jacking rod, which is positioned outside the guide groove, is rotatably connected with a pushing wheel;

the opening assembly includes: the first support column is arranged on the inner wall of the processing table, and one end of the first support column is rotatably connected with a first rotating shaft; the first gear is arranged at one end of the first rotating shaft, and a first rotating disc is arranged on the first gear; the second supporting column is arranged on the inner wall of the processing table, a second gear is rotatably connected onto the second supporting column, a second turntable is arranged on the second gear, and a conveying belt is arranged between the first turntable and the second turntable; the sliding groove is arranged in the machining table, a sliding block is arranged in the sliding groove, and a guide column is arranged on the sliding block; the first toothed plate is sleeved on the guide post in a sliding manner, and the first toothed plate is matched with the first gear; the second toothed plate is mounted on the first toothed plate, the second toothed plate is matched with the second gear, a supporting plate is mounted at one end of the second toothed plate, and the supporting plate is matched with the jacking opening;

the drive assembly includes: the third supporting column is arranged on the processing table and is rotatably connected with a second rotating shaft; the output motor is arranged at one end of the second rotating shaft, and the output end of the output motor is connected with one end, far away from the first gear, of the first rotating shaft; the power receiving plate is arranged on the inner wall of the mainframe box and is connected with an input end line of the output motor; the current conducting plate is installed go up mould one side, the input of current conducting plate with total power supply circuit connects, the current conducting plate with the electricity board is mutually supported.

2. The daily plastic product injection molding device capable of eliminating the crazing defect of the injection molding part as claimed in claim 1, wherein the length of the guide column is not less than the width of the jacking port, and the length and the width of the outer edge of the support plate are equal to the length and the width of the inner edge of the jacking port.

3. The daily plastic product injection molding device capable of eliminating the silver mark defect of the injection molding part as claimed in claim 1, wherein the rotating force required by the rotating connection part of the second rotating shaft and the third supporting column when rotating is larger than the rotating force required by the rotating connection part of the first rotating shaft and the first supporting column when rotating.

4. The daily plastic product injection molding device capable of eliminating the silver mark defect of the injection molding part as claimed in claim 1, wherein the reset component comprises: the reverse conducting plate is arranged on one side of the upper die and is connected with the main power circuit, and the reverse conducting plate is matched with the power connection plate; the reset block is installed on the transmission toothed chain, a second spring is installed on one side of the reset block, and one end of the second spring is connected with the inner wall of the machining table.

5. The daily-use plastic product injection molding device capable of eliminating the silver mark defects of injection molding parts according to claim 1, wherein a cooling tank is arranged inside the main machine box, cooling liquid is arranged inside the cooling tank, a cooling block is arranged on the side part of the lower mold, a water inlet pipe and a water outlet pipe are arranged on the cooling block, the water inlet pipe and the water outlet pipe are connected with the cooling tank, and a pump body is arranged at the joint of the water inlet pipe and the cooling tank.

6. The injection molding process of the daily plastic product capable of eliminating the silver mark defect of the injection molding part is characterized in that the injection molding device of the daily plastic product capable of eliminating the silver mark defect of the injection molding part, which is disclosed by any one of claims 1 to 4, is adopted, and comprises the following steps:

s1, preparing injection molding raw materials: the injection molding base material and the silver line defect improver are mixed according to the weight ratio (8-10): 1, mixing, smelting at 160-210 ℃ for 10-20min, extruding in a double-screw extruder at 150-170 ℃ for 5-10min, and cooling to natural room temperature to obtain an injection molding raw material after the extrusion is finished;

s2, injection molding treatment: performing injection molding on the injection molding raw material through an upper mold and a lower mold in an injection molding device;

s3, demolding treatment: after the injection molding is finished, starting a main power supply, driving and controlling the cylinder to ascend, and enabling the upper die and the lower die to be separated from each other; in the process of moving the upper die, the driving assembly can be operated, the opening assembly is driven to open the jacking port, meanwhile, the jacking assembly can be operated under the driving of the opening assembly to jack up the injection molding finished product attached to the lower die, so that the automatic demolding effect is realized, and then the upper die is continuously lifted, the driving assembly is reversely operated in the lifting process to drive the reset assembly to operate, so that the automatic demolding assembly can be reset to wait for the next injection molding.

7. The injection molding process of the daily plastic product capable of eliminating the silver mark defects of the injection molding part according to claim 6, wherein the preparation method of the silver mark defect improver comprises the following steps:

step one, modifying bentonite: feeding bentonite into a calcining furnace for calcining at the calcining temperature of 300-500 ℃ for 30-40min, finishing calcining, then placing the calcined bentonite into a sodium alginate solution with the mass fraction of 30-50% for ultrasonic reaction for 10-20min, wherein the ultrasonic power is 200-300W, finishing ultrasonic treatment, washing with water, and drying to obtain modified bentonite;

step two, grafting bentonite: feeding the modified bentonite into a silane coupling agent KH560 for distillation treatment, wherein the distillation temperature is 100-200 ℃, the distillation time is 10-20min, after the distillation is finished, washing and drying the modified bentonite, then feeding the modified bentonite into a maleic anhydride solution for stirring reaction for 10-20min, wherein the stirring temperature is 90-100 ℃, the stirring speed is 300-500r/min, and after the stirring is finished, obtaining grafted bentonite; wherein the maleic anhydride solution is maleic anhydride, and the mass fraction of the hydrochloric acid dopamine solution is 10-20% according to the weight ratio of 1:3, mixing to obtain the finished product;

step three, preparing the silver streak defect improver: mixing gum arabic with a modifying material according to a weight ratio of 3:1, mixing at the mixing speed of 100-200r/min, at the mixing temperature of 90-150 ℃ for 20-30min to obtain modified resin, and mixing with the grafted bentonite according to the weight ratio of 3:1, feeding the mixture into a reaction furnace for reaction, wherein the reaction speed is 150-250r/min, the reaction temperature is 130-140 ℃, the reaction time is 40-50min, and the silver streak defect improver is obtained after the reaction is finished, wherein the modified material is prepared from melamine and paraformaldehyde according to the weight ratio of 1:3, then adding deionized water and sodium hydroxide, heating to 75 ℃, reacting for 10min, then adding terephthalaldehyde, and continuing to react for 5min to obtain the composite.

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