Injection molding device and injection molding process

Abstract

The application belongs to the technical field of injection molding equipment, and particularly relates to an injection molding part forming device and an injection molding process thereof, which comprises a rack and a demolding mechanism, the rack is provided with a fixed mold plate and a movable mold plate, and the fixed mold plate and the movable mold plate form a cavity; the demolding mechanism is installed in the movable mold plate and is used for demolding and discharging of the injection molding part after forming, and comprises a gas supply unit and an opening and closing mechanism; wherein, a gas storage cavity is arranged in the movable mold plate and is used for temporarily storing compressed gas, a gas supply channel is arranged between the cavity and the gas storage cavity, a gas charging channel is arranged between the gas supply unit and the gas storage cavity, the opening and closing mechanism is used for switching between the gas charging stage and the demolding stage and is linked with the movement of the movable mold plate; the gas storage cavity is arranged in the movable mold plate, and the gas supply unit is used for pre-supplying compressed gas to the gas storage cavity for temporary storage, so that the delay and fluctuation caused by direct supply are avoided, the demolding effect and efficiency are ensured, and the opening and closing mechanism is used for switching between the gas charging stage and the demolding stage, so that the temporary storage and demolding supply of compressed air are effectively ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of injection molding equipment, and particularly relates to an injection molding part forming device and an injection molding process thereof. BACKGROUND

[0002] The demolding of the injection molding part is a key step of discharging in the injection molding process. At present, the mainstream demolding modes in the industry mainly include mechanical demolding, hydraulic demolding and pneumatic demolding. The pneumatic demolding uses compressed gas to form a separation force to make the injection molding part separate from the cavity by introducing the compressed gas between the cavity and the injection molding part, and has the advantages of non-contact demolding, no surface damage, fast response speed, simple structure maintenance and the like.

[0003] In actual application, the traditional pneumatic demolding directly introduces the compressed gas into the cavity through the gas passage. The gas pressure is prone to fluctuation, and there may be delay, excessive or insufficient gas pressure, thereby affecting the demolding effect and efficiency. SUMMARY

[0004] The application aims to solve the above technical problems, and provides an injection molding part forming device and an injection molding process thereof, which can avoid excessive gas pressure fluctuation and linkage with the opening and closing action of the movable mold plate, and effectively ensure the demolding effect and efficiency of the injection molding part.

[0005] Therefore, the application provides an injection molding part forming device, which comprises:

[0006] A rack is provided with a fixed mold plate and a movable mold plate arranged correspondingly, and the opposite side of the fixed mold plate and the movable mold plate is formed with a cavity for forming the injection molding part;

[0007] A demolding mechanism is installed in the movable mold plate and is used for discharging the demolding part after forming, and comprises a gas supply unit and an opening and closing mechanism, and has a gas charging stage and a demolding stage;

[0008] The movable mold plate is provided with a gas storage cavity for temporarily storing the compressed gas provided by the gas supply unit, and is provided with a gas supply flow channel between the cavity and the gas supply unit, and is provided with a gas charging flow channel between the gas supply unit, and the opening and closing mechanism is used for switching between the gas charging stage and the demolding stage of the demolding mechanism, and is linked with the movement of the movable mold plate.

[0009] In the above technical solution, further:

[0010] The movable mold plate is provided with a mounting cavity, and the opening and closing mechanism comprises:

[0011] A valve seat is arranged in the mounting cavity;

[0012] A first valve core is used for controlling the opening and closing of the gas supply flow channel;

[0013] A second valve core is used for controlling the opening and closing of the gas charging flow channel;

[0014] A linkage assembly is configured to convert the movement of the movable mold plate into synchronous rotation of the first valve core and the second valve core.

[0015] The first valve core and the second valve core are respectively provided with a first through hole and a second through hole arranged perpendicularly to each other, and are configured to alternately open and close the gas flow channel and the inflation flow channel.

[0016] In the above technical solution, further, the linkage assembly comprises:

[0017] A linkage shaft is installed in the valve seat and connected to the first valve core and the second valve core at both ends, and is configured to synchronously rotate the two valve cores.

[0018] A drive shaft is connected to the second valve core at one end and extends out of the movable mold plate to be provided with a ratchet wheel.

[0019] Cross bars are installed on the rack and arranged symmetrically on both sides of the ratchet wheel, and the length direction is parallel to the movement direction of the movable mold plate.

[0020] A plurality of pawls are arranged at equal intervals along the length direction of the two cross bars, and the pawls on the two cross bars are arranged in opposite directions and are engaged with the ratchet teeth on the ratchet wheel when the cross bars move.

[0021] The number of pawls on each cross bar is one quarter of the number of ratchet teeth on the ratchet wheel, and is configured to drive the first valve core and the second valve core to synchronously rotate 90° for a single movement of the movable mold plate, and the pawl is provided with a torsional spring for rotation reset.

[0022] In the above technical solution, further:

[0023] A pressure relief cavity is formed in the movable mold plate, and a pressure relief mechanism is installed in the pressure relief cavity.

[0024] The pressure relief mechanism is configured to release pressure and exhaust after the gas pressure in the gas storage cavity exceeds the threshold.

[0025] An adjustment mechanism is connected to the pressure relief mechanism and is configured to adjust the pressure relief threshold of the gas storage cavity.

[0026] The side surface of the pressure relief cavity is provided with an exhaust port, and a through port is provided between the pressure relief cavity and the gas storage cavity, and the through port is controlled to open and close by the pressure relief mechanism.

[0027] In the above technical solution, further, the pressure relief mechanism comprises:

[0028] A connecting block is connected to the movable mold plate.

[0029] A third valve core is installed in the pressure relief cavity and is configured to control the opening and closing of the through port.

[0030] A spring is installed in the pressure relief cavity and abuts against the third valve core and the connecting block at both ends.

[0031] In the above technical solution, further, the adjusting mechanism comprises:

[0032] The air guide cylinder is installed in the connecting block and extends to the pressure relief cavity and the third valve core sliding seal at one end, and is provided with a connecting pipe and a gas filling flow channel at the other end;

[0033] The three-way joint is connected and communicated with the gas supply unit, the connecting pipe and the gas filling flow channel;

[0034] The one-way valve is installed between the three-way joint and the gas filling flow channel and is used for one-way communication of the gas filling flow channel.

[0035] The present application provides an injection molding process of an injection molding device, comprising the following steps:

[0036] S1: the equipment is started, and preset initial air pressure range and preset target air pressure range are set;

[0037] S2: the movable mold plate approaches the fixed mold plate to perform mold closing, and the gas filling flow channel is opened, while the gas supply flow channel is closed;

[0038] S3: the gas supply unit simultaneously fills the compressed gas in the preset initial air pressure range into the gas storage cavity and the air guide cylinder through the gas filling flow channel;

[0039] S4: the air pressure value in the gas storage cavity and the temperature control stage during injection molding are acquired in real time;

[0040] ①: when being in the heating stage or the holding stage, the air pressure value in the gas storage cavity is adjusted to maintain in the preset initial air pressure range;

[0041] ②: when being in the cooling stage, the air pressure value in the gas storage cavity is adjusted to rise to the preset target air pressure range;

[0042] S5: the movable mold plate moves away from the fixed mold plate to perform mold opening, and the gas filling flow channel is closed, while the gas supply flow channel is opened;

[0043] S6: the demolding mechanism is used to complete the discharging of the injection molding product, and S2-S6 are repeated.

[0044] In the above technical solution, further, the adjusting of the air pressure value in the gas storage cavity in S4 comprises:

[0045] By comparing the real-time acquired air pressure value in the gas storage cavity with the preset initial air pressure range or the preset target air pressure range:

[0046] ①: when the real-time acquired air pressure value in the gas storage cavity is lower than the minimum value of the air pressure range, the gas supply pressure of the gas supply unit is increased to supplement the air pressure in the gas storage cavity;

[0047] ②: when the real-time acquired gas pressure value in the gas storage cavity is higher than the maximum value of the gas pressure range, the gas supply pressure of the gas supply unit is reduced, and the gas pressure in the gas storage cavity is released.

[0048] In the above technical scheme, further, S4 further comprises:

[0049] After the gas pressure in the gas storage cavity is supplemented or released, the gas pressure difference value between the gas supply pressure value of the gas supply unit and the gas pressure value in the gas storage cavity is calculated, and it is judged and determined whether the gas pressure difference value is within the preset difference value range, if yes, the supply of compressed gas is maintained, and if not, an abnormality is judged and the machine is stopped and warned.

[0050] In the above technical scheme, further, S1 further comprises:

[0051] A preset compensation value is obtained, the ambient temperature of the current movable die plate is obtained, and it is judged and determined whether the ambient temperature is within the preset ambient temperature range, if yes, the preset initial gas pressure range and the preset target gas pressure range of S1 are maintained, and if not, the preset initial gas pressure range and the preset target gas pressure range are adjusted:

[0052] ①: when the ambient temperature is higher than the maximum value of the preset ambient temperature range, the preset initial gas pressure range and the preset target gas pressure range are both reduced by the compensation value;

[0053] ②: when the ambient temperature is lower than the minimum value of the preset ambient temperature range, the preset initial gas pressure range and the preset target gas pressure range are both increased by the compensation value.

[0054] The beneficial effects of the present application are:

[0055] 1. By setting the gas storage cavity in the movable die plate, and pre-supplying compressed gas to the gas storage cavity by the gas supply unit for temporary storage, the direct supply of compressed air is avoided, and delay and fluctuation are avoided, the demolding effect and demolding efficiency are guaranteed, and the opening and closing mechanism is convenient for switching the inflation stage and the demolding stage, effectively guaranteeing the temporary storage and demolding supply of compressed air.

[0056] 2. The first valve core and the second valve core are synchronously rotated, and the first through hole and the second through hole perpendicular to each other are respectively arranged, so that the inflation stage and the demolding stage can be alternately switched, that is, only a single power input is needed, and the synchronism and convenience are improved.

[0057] 3. Through the two groups of opposite direction setting pawls on the cross rod, and the number of the pawls is one fourth of the number of the ratchet teeth on the ratchet wheel, and then the movement of each time is driven to rotate 90 degrees of the ratchet wheel through the restriction of the pawls when the movable mold plate opens and closes the mold, and then the alternating switching of the inflation stage and the demolding stage is linked with the opening and closing of the movable mold plate, effectively guaranteeing the timeliness and efficiency of the inflation and demolding supply of the compressed gas, and avoiding the delay.

[0058] 4. Through the same gas pressure in the gas guide cylinder and the gas storage cavity in the pressure relief mechanism, the one-way valve can adjust the pressure relief threshold of the gas storage cavity by adjusting the gas supply pressure of the gas supply unit, so that the appropriate pressure relief threshold can be set under different gas pressure requirements, and the safety of the device is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 is the structural schematic diagram of the present application;

[0060] Figure 2 is the side view of the present application;

[0061] Figure 3 is the sectional view at A-A in the present application Figure 2 ;

[0062] Figure 4 is the enlarged view at C in the present application Figure 3 ;

[0063] Figure 5 is the sectional view at B-B in the present application Figure 3 ;

[0064] Figure 6 is the enlarged view at D in the present application Figure 5 ;

[0065] Figure 7 is the partial explosion view of the movable mold plate of the present application

[0066] Figure 8 is the flowchart of the injection molding process of the present application

[0067] The figure is marked as: 1, rack; 2, fixed mold plate; 3, movable mold plate; 30, installation cavity; 31, pressure relief cavity; 4, gas supply unit; 5, opening and closing mechanism; 50, valve seat; 51, first valve core; 52, second valve core; 53, linkage assembly; 530, linkage shaft; 531, drive shaft; 532, ratchet; 533, cross rod; 534, pawl; 54, first through hole; 55, second through hole; 6, gas storage cavity; 7, gas supply flow channel; 8, inflation flow channel; 9, pressure relief mechanism; 90, connecting block; 91, third valve core; 92, spring; 10, adjusting mechanism; 100, gas guide cylinder; 101, three-way joint; 102, check valve; 103, connecting pipe; 11, exhaust port; 12, through port. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0069] Embodiment 1

[0070] The embodiment provides an injection molding device, which comprises:

[0071] A rack 1 is provided with a fixed mold plate 2 and a movable mold plate 3, and the opposite side of the fixed mold plate 2 and the movable mold plate 3 is provided with a mold cavity for injection molding;

[0072] A demolding mechanism is installed in the movable mold plate 3, and is used for demolding and discharging after injection molding, and comprises a gas supply unit 4 and an opening and closing mechanism 5, and has an inflation stage and a demolding stage;

[0073] The movable mold plate 3 is provided with a gas storage cavity 6 for temporarily storing compressed gas provided by the gas supply unit 4, and is provided with a gas supply flow channel 7 between the mold cavity and the gas supply unit 4, and is provided with an inflation flow channel 8 between the gas supply unit 4, and the opening and closing mechanism 5 is used for switching between the inflation stage and the demolding stage of the demolding mechanism, and is linked with the movement of the movable mold plate 3;

[0074] Meanwhile, the compressed gas can be compressed air, and the injection molding device further comprises other mechanisms possessed by a conventional injection molding device, such as an automatic control system, a driving mechanism, a material feeding and injecting mechanism, and a heat exchange mechanism, etc., which are all mature technologies in the prior art and can be obtained by a person skilled in the art from a conventional injection molding device, and thus will not be described herein;

[0075] In addition, the gas supply unit 4 is a mature technology in the prior art, such as comprising an air compressor, a gas storage tank, a pressure regulating valve, etc., which can be obtained by a person skilled in the art from a conventional gas supply unit 4, and thus will not be described herein;

[0076] Moreover, in order to facilitate the opening of the gas storage cavity 6, the gas filling flow channel 8 and the gas supply flow channel 7 in the movable mold plate 3, the movable mold plate 3 can be divided into two parts, and a sealing strip is arranged between the two parts of the movable mold plate 3 for sealing and bolt connection. For the skilled in the art, the movable mold plate 3 can be manufactured by routine operation, which will not be described here.

[0077] The gas supply flow channel 7 can include a main flow channel and a plurality of sub-flow channels, and the plurality of sub-flow channels can be arranged in a corresponding position and quantity according to the specific injection molding product. For the skilled in the art, the routine setting according to the needs will not be described here.

[0078] As can be seen from the embodiment, by arranging the gas storage cavity 6 in the movable mold plate 3, and pre-storing compressed gas in the gas storage cavity 6 by the gas supply unit 4, the direct supply of compressed air is avoided, and the delay and fluctuation are avoided, the demolding effect and demolding efficiency are guaranteed, and the opening and closing mechanism 5 facilitates the switching of the demolding mechanism in the inflation stage and the demolding stage, effectively guaranteeing the temporary storage and demolding supply of compressed air.

[0079] Embodiment 2:

[0080] The injection molding device provided in the embodiment further has the following technical features in addition to the technical solutions of the above-mentioned embodiments.

[0081] The movable mold plate 3 is provided with a mounting cavity 30, and the opening and closing mechanism 5 comprises:

[0082] A valve seat 50 is arranged in the mounting cavity 30;

[0083] A first valve core 51 is used to control the opening and closing of the gas supply flow channel 7;

[0084] A second valve core 52 is used to control the opening and closing of the gas filling flow channel 8;

[0085] A linkage assembly 53 is used to convert the movement of the movable mold plate 3 into the synchronous rotation of the first valve core 51 and the second valve core 52;

[0086] Among them, the first valve core 51 and the second valve core 52 are respectively provided with a first through hole 54 and a second through hole 55 arranged perpendicularly to each other, and are used for the alternate opening and closing of the gas supply flow channel 7 and the gas filling flow channel 8.

[0087] As can be seen from the embodiment, by the synchronous rotation of the first valve core 51 and the second valve core 52, and the first through hole 54 and the second through hole 55 arranged perpendicularly to each other, the inflation stage and the demolding stage can be alternately switched, that is, only a single power (i.e. the movement of the movable mold plate 3) is needed, and the synchronization and convenience are improved.

[0088] Embodiment 3:

[0089] The embodiment provides an injection molding part forming device, in addition to comprising the technical scheme of the above embodiment, further has the following technical features, the linkage assembly 53 comprises:

[0090] The linkage shaft 530 is installed in the valve seat 50, and two ends are connected with the first valve core 51 and the second valve core 52 respectively, and is used for synchronous rotation of the two;

[0091] The driving shaft 531 is connected with the second valve core 52 at one end, and extends out of the movable mold plate 3 and is provided with a ratchet wheel 532 at the other end;

[0092] The cross bar 533 is installed on the rack 1 and is symmetrically arranged on both sides of the ratchet wheel 532, and the length direction is parallel to the moving direction of the movable mold plate 3;

[0093] The pawl 534 is arranged at equal intervals along the length direction of the two cross bars 533, and the directions of the pawls 534 on the two cross bars 533 are opposite, and the pawls 534 are engaged with the ratchet teeth on the ratchet wheel 532 when the cross bars 533 move;

[0094] The number of the pawls 534 on each cross bar 533 is one fourth of the number of the ratchet teeth on the ratchet wheel 532, and is used for driving the first valve core 51 and the second valve core 52 to rotate 90° synchronously in a single movement of the movable mold plate 3, and the pawl 534 is provided with a torsional spring for rotation reset;

[0095] Meanwhile, the linkage shaft 530 can be clamped between the first valve core 51 and the second valve core 52, the driving shaft 531 can be clamped between the second valve core 52 and the ratchet wheel 532, and the ratchet wheel 532 can be connected with the ratchet wheel 532 through a key or a spline;

[0096] And the cross bar 533 and the rack 1 can be fixedly connected through a connecting rod.

[0097] As can be seen from the embodiment, through the two groups of pawls 534 on the cross bar 533, the number of the pawls 534 is one fourth of the number of the ratchet teeth on the ratchet wheel 532, and then the ratchet wheel 532 can be driven to rotate 90° in each movement of the movable mold plate 3, so that the alternating switching of the inflation stage and the demolding stage is linked with the opening and closing of the movable mold plate 3, the timeliness and efficiency of the inflation and demolding supply of the compressed gas are effectively ensured, and the delay is avoided;

[0098] Specifically, when the movable die plate 3 is closed, the ratchet wheel 532 is engaged with the pawls 534 on one side of the horizontal rod 533, and is not engaged with the pawls 534 on the other side of the horizontal rod 533. The plurality of pawls 534 sequentially push the ratchet wheel 532 to rotate, and then promote the ratchet wheel 532 to rotate 90° and stop. When the movable die plate 3 is opened, the ratchet wheel 532 is engaged with the pawls 534 on the other side of the horizontal rod 533. The plurality of pawls 534 sequentially push the ratchet wheel 532 to rotate, and then promote the ratchet wheel 532 to rotate 90° and stop. Thus, the ratchet wheel 532 can be rotated 90° in each opening or closing movement of the movable die plate 3, thereby facilitating the adjustment and control of the alternating opening and closing of the first valve core 51 and the second valve core 52. Moreover, the single input (i.e., the movement of the movable die plate 3) can realize the synchronous adjustment of the first valve core 51 and the second valve core 52, thereby effectively reducing.

[0099] Embodiment 4

[0100] The embodiment provides an injection molding part forming device, in addition to the technical solutions of the above-mentioned embodiments, further having the following technical features:

[0101] The movable die plate 3 is provided with a pressure relief cavity 31, and the pressure relief cavity 31 is provided with:

[0102] The pressure relief mechanism 9 is used for pressure relief and exhaust after the gas pressure in the gas storage cavity 6 exceeds the limit.

[0103] The adjustment mechanism 10 is connected with the pressure relief mechanism 9 and is used for adjusting the pressure relief threshold of the gas storage cavity 6.

[0104] The side surface of the pressure relief cavity 31 is provided with an exhaust port 11, and the exhaust port 11 is provided with a through port 12 connected with the gas storage cavity 6. The through port 12 is controlled to open and close by the pressure relief mechanism 9.

[0105] It can be seen from the embodiment that, by arranging the pressure relief cavity 31 and the pressure relief mechanism 9, the pressure relief and exhaust can be performed in time after the gas pressure in the gas storage cavity 6 exceeds the limit, so that the product is not damaged and the safety hazard is not caused due to the high gas pressure during demolding, and the product quality and safety are maintained. The adjustment mechanism 10 can adjust different pressure relief thresholds based on different pressure relief requirements, thereby meeting the gas pressure requirements at different stages and improving the applicability and adjustability.

[0106] The exhaust port 11 is used for exhausting the gas pressure in the gas storage cavity after the through port 12 is opened.

[0107] Embodiment 5

[0108] The embodiment provides an injection molding part forming device, in addition to the technical solutions of the above-mentioned embodiments, further having the following technical features, the pressure relief mechanism 9 comprises:

[0109] The connecting block 90 is connected to the movable die plate 3.

[0110] The third valve core 91 is installed in the pressure relief cavity 31 and is used for controlling the opening and closing of the through port 12.

[0111] The spring 92 is installed in the pressure relief cavity 31 and abuts against the third valve core 91 and the connecting block 90 at both ends.

[0112] The side of the third valve core 91 close to the through port 12 can be provided with a sealing gasket made of rubber.

[0113] It can be seen from the embodiment that the spring 92 pushes the third valve core 91 to close the through port 12, and when the gas pressure in the gas storage cavity 6 exceeds the limit, the third valve core 91 is pushed to compress the spring 92 to perform exhaust pressure relief. The structure is simple, and the connecting block 90 is provided, which on the one hand facilitates the opening of the pressure relief cavity 31 and the disassembly and assembly of the third valve core 91 and the spring 92, improves the convenience of production and maintenance, and on the other hand facilitates the abutment of one end of the spring 92, and ensures the force of the spring 92 on the third valve core 91.

[0114] Embodiment 6:

[0115] The embodiment provides an injection molding part forming device, in addition to the technical solutions of the above-mentioned embodiments, further having the following technical features, the adjusting mechanism 10 comprises:

[0116] The air guide cylinder 100 is installed in the connecting block 90 and extends to the pressure relief cavity 31 and the third valve core 91 at one end and is slidably sealed, and the other end is provided with a connecting pipe 103 and is in communication with the inflation flow channel 8;

[0117] The three-way joint 101 is connected to the gas supply unit 4, the connecting pipe 103 and the inflation flow channel 8 in communication;

[0118] The one-way valve 102 is installed between the three-way joint 101 and the inflation flow channel 8 and is used for one-way communication of the inflation flow channel 8.

[0119] It can be seen from the embodiment that by the same gas pressure in the pressure relief mechanism 9, the air guide cylinder 100 and the gas storage cavity 6, the one-way valve 102 can adjust the pressure relief threshold of the gas storage cavity 6 by adjusting the gas supply pressure of the gas supply unit 4, which is convenient for setting appropriate pressure relief thresholds under different gas pressure requirements and ensures the use safety of the device.

[0120] Specifically, when the air supply unit 4 is in the initial air supply stage, the air pressure in the air guide cylinder 100 and the air storage cavity 6 stably rises, and after reaching a stable air pressure, the one-way valve 102 and the third valve core 91 are both closed. At this time, in the pressure relief cavity 31, the third valve core 91 is acted on by the stable air pressure in the air guide cylinder 100 and the spring 92 on one side, and by the stable air pressure in the air storage cavity 6 on the other side. When the air pressure in the air storage cavity 6 rises due to unexpected circumstances, the one-way valve 102 is provided, and the first valve core 51 is also in a closed state, thereby enabling the air pressure to be discharged only from the communication port 12 that is in communication with the pressure relief cavity 31. That is, the pressure relief threshold at this time is formed by the resistance jointly generated by the stable air pressure and the spring 92. The pressure relief threshold of the air storage cavity 6 can be adjusted by adjusting the air pressure filled into the air guide cylinder 100 by the air supply unit 4, which is highly convenient and does not require a complex adjustment mechanism 10 to be provided at the die plate 3, thereby achieving a simple structure and low setting cost.

[0121] Moreover, while the pressure relief threshold of the air storage cavity 6 is adjusted in this way, the air storage cavity 6 can also be pressurized or depressurized (i.e., the air pressure in the air storage cavity 6 is adjusted) based on the size of the air pressure filled into the air guide cylinder 100 by the air supply unit 4. Specifically, when the air storage cavity 6 needs to be pressurized, the air pressure of the air supply unit 4 can be increased. At this time, the air pressure will reopen the one-way valve 102, thereby increasing the air storage cavity 6. At the same time, the pressure relief threshold will also be increased by increasing the air pressure in the air guide cylinder 100, thereby avoiding pressure relief during pressurization. The adaptability is good. Conversely, when the air storage cavity 6 needs to be depressurized, the air pressure of the air supply unit 4 can be reduced. At this time, the one-way valve 102 will be closed, and the air pressure in the air guide cylinder 100 will also decrease, thereby reducing the pressure relief threshold. Since the air pressure in the air storage cavity 6 is high, the third valve core 91 will be pushed open to depressurize, thereby achieving the effect of actively depressurizing the air storage cavity 6. During the entire pressurization and depressurization process, only the air pressure of the air supply unit 4 needs to be controlled and adjusted, which is simple in structure, convenient to operate, and has high applicability and practicality.

[0122] The adjustment of the air pressure of the air supply unit 4 is a mature technology known to those skilled in the art from the operation of conventional air supply units 4, and thus will not be described here.

[0123] Embodiment 7

[0124] The present embodiment provides an injection molding process of an injection molding device, which comprises the following steps:

[0125] S1: The equipment is started, and an initial air pressure range and a target air pressure range are preset.

[0126] S2: The movable die plate 3 approaches the fixed die plate 2 to close the mold, and the air charging flow channel 8 is opened, while the air supply flow channel 7 is closed.

[0127] S3: The air supply unit 4 simultaneously fills the preset initial air pressure range of compressed gas into the gas storage cavity 6 and the gas guide cylinder 100 through the inflation flow channel 8;

[0128] S4: Real-time acquisition of the air pressure value in the gas storage cavity 6 and the temperature control stage during injection molding;

[0129] ①: When located in the heating stage or the holding stage, adjust the air pressure value in the gas storage cavity 6 to maintain in the preset initial air pressure range;

[0130] ②: When located in the cooling stage, adjust the air pressure value in the gas storage cavity 6 to rise to the preset target air pressure range;

[0131] S5: The movable mold plate 3 moves away from the fixed mold plate 2 to open the mold, and the inflation flow channel 8 is closed, and the air supply flow channel 7 is opened;

[0132] S6: The demolding mechanism completes the discharging of the injection molded product, and repeats S2-S6;

[0133] The preset initial air pressure range is a certain amount of air pressure pre-filled into the gas storage cavity 6, which is also less than the preset target air pressure range, avoiding the influence of temperature on the air pressure in the gas storage cavity 6 during the heating and holding stages of the mold plate, avoiding the overpressure caused by excessive air pressure during mold opening, and the preset target air pressure range avoids the influence of temperature on the air pressure in the gas storage cavity 6 during the cooling stage, which is the guarantee for the final control and adjustment of the stable demolding air pressure.

[0134] The specific setting data of the preset initial air pressure range and the preset target air pressure range is set according to the actual production needs and conditions, which is a routine operation made by the skilled person in the art, and will not be repeated here.

[0135] In addition, how to obtain the air pressure value in the gas storage cavity 6 and the temperature control stage during injection molding are both mature technologies, which are routine operations for the skilled person in the art, and will not be repeated here.

[0136] The temperature control stage is the heating stage, the holding stage and the cooling stage under the mold clamping state.

[0137] As can be seen from the embodiment, by setting the gas storage cavity 6 in the movable mold plate 3 and pre-storing compressed gas in the gas storage cavity 6 through the air supply unit 4, the direct supply of compressed air is avoided, which is prone to delay and fluctuation, ensuring the demolding effect and efficiency, and the opening and closing mechanism 5 facilitates the switching of the demolding mechanism between the inflation stage and the demolding stage, effectively ensuring the temporary storage and demolding supply of compressed air.

[0138] And in the mold heating stage, holding stage and cooling stage, the air pressure in the gas storage cavity 6 is regulated to avoid excessive or excessive air pressure, reduce the delay, effectively ensure the stability of the demolding air pressure, avoid damage to the product or affect the demolding effect;

[0139] At the same time, the inflation runner 8 and the gas supply runner 7 are alternately opened and closed, and the mold opening and closing of the movable mold plate 3 are linked, the timeliness of adjustment is improved, and the delay is avoided, which affects the demolding efficiency.

[0140] Embodiment 8:

[0141] The embodiment provides an injection molding process of an injection molding device, in addition to the technical solutions of the above-mentioned embodiments, further having the following technical features, the air pressure value in the gas storage cavity 6 in S4 is adjusted to include:

[0142] By comparing the real-time obtained air pressure value in the gas storage cavity 6 with the preset initial air pressure range or the preset target air pressure range:

[0143] ①: When the real-time obtained air pressure value in the gas storage cavity 6 is lower than the minimum value of the air pressure range, increase the air supply pressure of the air supply unit 4, and supplement the air pressure in the gas storage cavity 6;

[0144] ②: When the real-time obtained air pressure value in the gas storage cavity 6 is higher than the maximum value of the air pressure range, reduce the air supply pressure of the air supply unit 4, and release the air pressure in the gas storage cavity 6.

[0145] It can be seen from the embodiment that by real-time obtaining the air pressure value in the gas storage cavity 6, in different temperature control stages, the preset initial air pressure range or the preset target air pressure range is compared and judged respectively, the supplement or release is taken corresponding to the situation that the preset initial air pressure range or the preset target air pressure range is exceeded, the stability of the air pressure in the gas storage cavity 6 is effectively ensured, and the safety of production and the effect and efficiency of demolding are ensured.

[0146] Embodiment 9:

[0147] The embodiment provides an injection molding process of an injection molding device, in addition to the technical solutions of the above-mentioned embodiments, further having the following technical features, S4 further includes:

[0148] After supplementing or releasing the air pressure in the gas storage cavity 6, the air pressure difference value between the air supply pressure value of the air supply unit 4 and the air pressure value in the gas storage cavity 6 is calculated, whether the air pressure difference value is located in the preset difference value range is judged and determined, if yes, the supply of compressed gas is maintained, and if not, the abnormality is judged, and the machine is stopped and warned.

[0149] The embodiment can be seen that, by calculating and judging the air pressure difference between the air supply pressure value of the air supply unit 4 and the air pressure value in the air storage cavity 6, the safety hidden danger caused by continuous production under abnormal conditions is avoided, and the safety of production is effectively improved;

[0150] Specifically, for example, when the inflation flow channel 8 is blocked or leaked, it will cause the air pressure difference between the air supply pressure value of the air supply unit 4 and the air pressure value in the air storage cavity 6 to be too large. In this abnormal condition, the machine needs to be stopped and warned; for example, when the pressure relief mechanism 9 is damaged, the air supply unit 4 cannot pressurize or depressurize the air pressure in the air storage cavity 6 to adjust, which will also cause the air pressure difference between the air supply pressure value of the air supply unit 4 and the air pressure value in the air storage cavity 6 to be too large. In this abnormal condition, the machine also needs to be stopped and warned.

[0151] Embodiment 10:

[0152] The embodiment provides an injection molding process of an injection molding device. In addition to the technical solutions of the above-mentioned embodiments, the injection molding process also has the following technical features. In S1, the following steps are further included:

[0153] A preset compensation value is obtained, and the ambient temperature of the current movable mold plate 3 is obtained. It is determined and determined whether the ambient temperature is within the preset ambient temperature range. If yes, the preset initial air pressure range and the preset target air pressure range of S1 are maintained. If not, the preset initial air pressure range and the preset target air pressure range are adjusted:

[0154] ①: When the ambient temperature is higher than the maximum value of the preset ambient temperature range, the preset initial air pressure range and the preset target air pressure range are both reduced by the compensation value;

[0155] ②: When the ambient temperature is lower than the minimum value of the preset ambient temperature range, the preset initial air pressure range and the preset target air pressure range are both increased by the compensation value;

[0156] The specific values of the compensation value and the preset ambient temperature range are set according to the actual production needs and conditions, which are the routine selection and operation of the person skilled in the art, and will not be repeated here.

[0157] The embodiment can be seen that, by detecting the ambient temperature of the movable mold plate 3 and comparing it with the preset ambient temperature range, the preset initial air pressure range and the preset target air pressure range are compensated and adjusted, the influence of environmental factors on the demolding air pressure at the final demolding is reduced, the stability of the demolding air pressure is ensured, and the effect and efficiency of the injection molding part demolding are ensured. The product quality and production efficiency are guaranteed.

[0158] The embodiments of the present application are described above with reference to the drawings, and the embodiments and features in the embodiments of the present application can be combined with each other without conflict, and the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are only illustrative but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and all belong to the protection of the present application.

Claims

1. An injection molding apparatus, characterized in that, include: The frame (1) is equipped with a fixed template (2) and a moving template (3) with corresponding settings, and the opposite side of the fixed template (2) and the moving template (3) forms a cavity for injection molding; The demolding mechanism is installed in the moving template (3) and is used for demolding and unloading after the injection molded part is formed. It includes an air supply unit (4) and an opening and closing mechanism (5), and has an air inflation stage and a demolding stage. The moving template (3) has an air storage cavity (6) for temporarily storing compressed gas supplied by the air supply unit (4), and an air supply channel (7) is provided between it and the cavity, and an air filling channel (8) is provided between it and the air supply unit (4). The opening and closing mechanism (5) is used to switch the demolding mechanism between the air filling stage and the demolding stage, and is linked with the movement of the moving template (3). The moving template (3) has an installation cavity (30) inside, and the opening and closing mechanism (5) includes: Valve seat (50) is disposed in mounting cavity (30); The first valve core (51) is used to control the opening and closing of the air supply channel (7); The second valve core (52) is used to control the opening and closing of the charging channel (8); The linkage component (53) is used to convert the movement of the moving template (3) into the synchronous rotation of the first valve core (51) and the second valve core (52); The first valve core (51) and the second valve core (52) are respectively provided with a first through hole (54) and a second through hole (55) arranged perpendicularly to each other, and are used for the alternating opening and closing of the air supply channel (7) and the air filling channel (8); The linkage component (53) includes: The linkage shaft (530) is installed inside the valve seat (50) and its two ends are respectively connected to the first valve core (51) and the second valve core (52) and used for the synchronous rotation of the two. The drive shaft (531) is connected to the second valve core (52) at one end and extends out of the moving template (3) at the other end, which is equipped with a ratchet (532). The crossbar (533) is installed on the frame (1) and is symmetrically arranged on both sides of the ratchet (532), and its length direction is parallel to the moving direction of the moving template (3); Pawls (534) are provided at equal intervals along the length of the two crossbars (533), and the pawls (534) on the two crossbars (533) are arranged in opposite directions, and engage with the ratchet teeth on the ratchet wheel (532) when the crossbars (533) move; The number of pawls (534) on each of the crossbars (533) is one-quarter of the number of ratchet teeth on the ratchet (532), and is used to drive the first valve core (51) and the second valve core (52) to rotate synchronously by 90° in a single movement of the moving template (3), and the pawls (534) are provided with torsion springs for rotation reset.

2. The injection molding apparatus according to claim 1, characterized in that: The moving template (3) is provided with a pressure relief cavity (31), and the pressure relief cavity (31) is equipped with: The pressure relief mechanism (9) is used to release pressure and exhaust gas when the gas pressure in the gas storage chamber (6) exceeds the limit; The regulating mechanism (10) is connected to the pressure relief mechanism (9) and is used to adjust the pressure relief threshold of the gas storage chamber (6); The pressure relief chamber (31) has an exhaust port (11) on its side and a guide port (12) between it and the gas storage chamber (6). The guide port (12) is controlled to open and close by the pressure relief mechanism (9).

3. The injection molding apparatus according to claim 2, characterized in that, The pressure relief mechanism (9) includes: The connecting block (90) is connected to the moving template (3); The third valve core (91) is installed in the pressure relief chamber (31) and is used to control the opening and closing of the guide port (12); The spring (92) is installed in the pressure relief chamber (31) and its two ends abut against the third valve core (91) and the connecting block (90) respectively.

4. The injection molding apparatus according to claim 3, characterized in that, The adjustment mechanism (10) includes: An air guide tube (100) is installed inside a connecting block (90), with one end extending to the pressure relief chamber (31) and slidingly sealing with the third valve core (91), and the other end being provided with a connecting pipe (103) that connects to the air supply channel (8); The three-way connector (101) is connected to the gas supply unit (4), the connecting pipe (103), and the air supply channel (8) respectively. A one-way valve (102) is installed between the three-way connector (101) and the charging passage (8) and is used for one-way passage of the charging passage (8).

5. An injection molding process applied to the injection molding apparatus of claim 4, characterized in that, Includes the following steps: S1: Equipment starts up, preset initial air pressure range and preset target air pressure range; S2: The moving template (3) approaches the fixed template (2) to close the mold and open the air inlet channel (8), while closing the air supply channel (7); S3: The gas supply unit (4) simultaneously fills the gas storage chamber (6) and the gas guide cylinder (100) with compressed gas within a preset initial pressure range through the gas filling channel (8); S4: Real-time acquisition of the air pressure value in the air storage chamber (6) and the temperature control stage during injection molding; ①: When in the heating or heat preservation stage, adjust the air pressure in the air storage chamber (6) to maintain it within the preset initial air pressure range; ②: When in the cooling stage, adjust the air pressure in the air storage chamber (6) to the preset target air pressure range; S5: The moving template (3) moves away from the fixed template (2) to open the mold and closes the air inlet channel (8), while opening the air supply channel (7); S6: The injection molded part is unloaded through the demolding mechanism, and S2-S6 are repeated.

6. The injection molding process of the injection molding apparatus according to claim 5, characterized in that, The pressure value in the gas storage chamber (6) of S4 is adjusted as follows: By comparing the real-time gas pressure value inside the gas storage chamber (6) with the preset initial gas pressure range or the preset target gas pressure range: ①: When the real-time gas pressure value in the gas storage chamber (6) is lower than the minimum value of the gas pressure range, increase the gas supply pressure of the gas supply unit (4) to replenish the gas pressure in the gas storage chamber (6); ②: When the real-time gas pressure value in the gas storage chamber (6) is higher than the maximum value of the gas pressure range, reduce the gas supply pressure of the gas supply unit (4) to release the gas pressure in the gas storage chamber (6).

7. The injection molding process of the injection molding apparatus according to claim 6, characterized in that, S4 also includes: After pressurizing or depressurizing the gas pressure in the gas storage chamber (6), calculate the gas pressure difference between the gas supply pressure of the gas supply unit (4) and the gas pressure in the gas storage chamber (6), determine whether the gas pressure difference is within the preset difference range, if so, maintain the supply of compressed gas, if not, determine the abnormality, and shut down the alarm.

8. The injection molding process of the injection molding apparatus according to claim 5, characterized in that, S1 also includes: The preset compensation value is obtained, and the ambient temperature of the current dynamic template (3) is obtained. It is determined whether the ambient temperature is within the preset ambient temperature range. If so, the preset initial air pressure range and preset target air pressure range of S1 are maintained. If not, the preset initial air pressure range and preset target air pressure range are adjusted. ①: When the ambient temperature is higher than the maximum value of the preset ambient temperature range, the preset initial air pressure range and the preset target air pressure range are both reduced by the compensation value. ②: When the ambient temperature is lower than the minimum value of the preset ambient temperature range, the preset initial air pressure range and the preset target air pressure range are both increased by a compensation value.

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