Plastic product injection molding mold for preventing residual material from solidifying

Abstract

The utility model relates to the field of mold technology, and specifically to a plastic product injection molding mold for preventing residual materials from solidifying, comprising a first mounting plate, a core fixing plate, a cavity plate and a connecting plate, wherein the four corners of the top of the core fixing plate are fixed with guide rods, the cavity plate is provided with guide holes, the guide rods are inserted into the guide holes in the cavity plate, a detachable core body is provided on the top of the core fixing plate, a cavity matching the core body is provided inside the cavity plate, a heating cavity is also provided on the top of the cavity plate, and a detachable heating device is provided in the heating cavity. The utility model adopts the principle of electromagnetic heating, by heating a coil in the mold, energizing the coil, and heating the mold through the alternating magnetic field generated by energizing the coil. Compared with traditional heating with a heating rod, this heating method is more uniform, has higher heating efficiency, and consumes less power.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to an injection molding mold for plastic products which can prevent residual materials from solidifying. Background Art

[0002] Injection molds are special tools used in the plastic injection molding process. The molten plastic is injected into the mold cavity by an injection molding machine. After cooling and solidification, the desired plastic product is obtained. Injection molds can produce plastic products of various sizes, shapes and functions to meet the needs of different fields. Injection molding technology is a widely used method in the production process of plastic products. However, after a long period of operation, when the traditional injection molding mold stops working, the residual plastic inside the mold is easy to cool and solidify, which brings difficulties to the subsequent injection molding operation. This not only affects production efficiency, but may also lead to a decline in product quality.

[0003] Chinese patent CN222004278U discloses an injection molding mold, specifically related to the field of plastic mold technology, including an injection molding support plate, one side of the outer end surface of the injection molding support plate is provided with a driving telescopic rod, the output shaft of the driving telescopic rod passes through the end surface of the injection molding support plate and extends to the inner side thereof, and the output shaft of the driving telescopic rod is provided with a mold support plate on one side of the injection molding support plate. The patent installs a heating rod in the mold, and heat is transferred to the mold through the heating rod for heating, thereby preventing the material from solidifying and clogging the mold.

[0004] Although this prior art uses a heating rod to heat the mold, since the heating rod is directly arranged in the mold and the heating rod is powered on for heating, the heat is unevenly conducted in the mold, resulting in a high temperature near the heating rod and a low temperature in the area far from the heating rod. In order to solve this problem, the temperature of the heating rod is continuously increased. As the temperature increases, the heating current increases, resulting in an increase in power consumption. Utility Model Content

[0005] The purpose of the utility model is to provide a plastic product injection molding mold that prevents residual materials from solidifying. The utility model adopts the principle of electromagnetic heating, a heating coil is placed in the mold, and power is supplied to the coil. The mold is heated by the alternating magnetic field generated by the power supply of the coil. Compared with traditional heating rod heating, this heating method is more uniform, has higher heating efficiency, and consumes less power.

[0006] In order to solve the problems of the prior art, the utility model provides a plastic product injection molding mold for preventing residual materials from solidifying, comprising a first mounting plate, a core fixing plate, a cavity plate and a connecting plate, wherein the four corners of the top of the core fixing plate are fixed with guide rods, the cavity plate is provided with guide holes, the guide rods are inserted into the guide holes in the cavity plate, the top of the core fixing plate is provided with a detachable core body, the cavity plate is provided with a cavity matching the core body, the top of the cavity plate is also provided with a heating cavity, and the heating cavity is provided with a detachable heating device, the cavity at the top of the cavity plate is also provided with a protrusion, the heating device includes a protective shell, the protective shell is provided with a coil for heating, when the coil is energized, the coil generates an alternating magnetic field, so that the temperature of the protrusion in the cavity plate increases. Preferably, a plurality of clamps for fixing the coil are also provided inside the protective shell, and a temperature sensor for detecting temperature is also provided inside the cavity plate.

[0007] Preferably, a protrusion is further provided in the cavity at the top of the cavity plate, and the heating device includes a protective shell, and a coil for heating is provided inside the protective shell. When the coil is energized, the coil generates an alternating magnetic field to increase the temperature of the protrusion in the cavity plate.

[0008] Preferably, a plurality of clamps for fixing the coil are further provided inside the protective shell, and a temperature sensor for detecting temperature is further provided inside the cavity plate.

[0009] Preferably, the protective shell is also provided with a cable interface for connecting a cable, and the cable interface is stuck in the cavity plate.

[0010] Preferably, a flow channel for material flow is provided on the protrusion in the cavity plate, a connecting plate is provided on the top of the cavity plate, a second mounting plate is provided on the top of the connecting plate, through holes are provided at the center positions of the connecting plate and the second mounting plate, and a material guide pipe is also provided in the through hole in the second mounting plate, and the bottom end of the material guide pipe passes through the through holes in the connecting plate and the second mounting plate and is inserted into the flow channel in the cavity plate.

[0011] Preferably, a cooling cavity is further provided at the bottom of the core fixing plate, a cooling pipe for cooling the product is arranged in the cooling cavity, and a pipe interface connected to the pipe is connected to the cooling pipe.

[0012] Preferably, the cooling pipe is a criss-crossed pipe structure for increasing the cooling area.

[0013] Preferably, a limiting member for limiting and fixing the core body is provided at a position of the core fixing plate close to the core body, and one side of the limiting member is in contact with the surface of the core body.

[0014] Preferably, mounting seats are fixed on both sides of the top of the first mounting plate, the top of the mounting seat is fixed with a first support plate, the top of the first support plate is fixed with a second support plate, the top of the second support plate is fixedly connected to the bottom of the core fixing plate, a first push plate is fixed at the center position of the top of the mounting seat, the top of the first push plate is fixed with a second push plate, a plurality of push rods are arranged on the second push plate, the push rods extend through the first support plate and the second support plate and extend into the core fixing plate, a plurality of reset rods are also arranged on the second push plate, a reset spring is sleeved on the reset rod, one end of the reset spring is connected to the first support plate, and the other end of the reset spring is connected to the second push plate.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The present application sets a coil in the heating cavity of the cavity plate. When the coil is energized, the coil generates an alternating magnetic field. The heating cavity has a protrusion, so that eddy currents are generated in the protrusions. The protrusions are heated by the eddy currents. Since it is a direct heating method, the heat conversion rate is particularly high, up to 95%. Compared with the traditional resistance heating method, electromagnetic heating has a higher thermal efficiency and can save 30% to 70% of electricity.

[0017] 2. The coil of the present application does not generate heat itself, has small thermal resistance and low thermal inertia, so the temperature control is real-time and accurate. The coil is wound with customized special high temperature and high pressure resistant special cable wire, has good insulation performance, does not need to be in direct contact with the mold, has no leakage or short circuit failure, and adopts internal heating method, so the heat is accumulated inside the bump to reduce heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a plastic product injection molding mold for preventing residual materials from solidifying in the utility model;

[0019] Figure 2 This is a schematic diagram of the first explosion structure of a plastic product injection molding mold for preventing residual materials from solidifying in the utility model;

[0020] Figure 3 This is a schematic diagram of the second explosion structure of a plastic product injection molding mold for preventing residual materials from solidifying in the utility model;

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of a plastic product injection molding mold for preventing residual materials from solidifying in the utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of a cavity plate of a plastic product injection molding mold for preventing residual materials from solidifying according to the utility model;

[0023] Figure 6 This is a schematic diagram of the first three-dimensional structure of a core fixing plate of a plastic product injection molding mold for preventing residual materials from solidifying according to the utility model;

[0024] Figure 7 It is a second three-dimensional structural schematic diagram of a plastic product injection molding mold for preventing residual materials from solidifying according to the utility model.

[0025] The numbers in the figure are: 1. first mounting plate; 2. mounting seat; 3. first support plate; 4. second support plate; 5. core fixing plate; 51. guide rod; 52. cooling cavity; 6. cavity plate; 61. flow channel; 7. connecting plate; 8. second mounting plate; 9. first push plate; 10. second push plate; 11. reset rod; 111. reset spring; 12. cooling pipe; 121. pipeline interface; 13. limit member; 14. core body; 15. material guide pipe; 16. protective shell; 161. clamp; 162. coil; 163. cable interface; 17. push rod. DETAILED DESCRIPTION

[0026] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Reference Figure 1-Figure 7 As shown, the utility model provides a plastic product injection molding mold for preventing residual materials from solidifying, comprising a first mounting plate 1, a core fixing plate 5, a cavity plate 6 and a connecting plate 7, wherein the four corners of the top of the core fixing plate 5 are fixed with guide rods 51, and the cavity plate 6 is provided with guide holes, and the guide rods 51 are inserted into the guide holes in the cavity plate 6, and the guide rods 51 are inserted into the guide holes in the cavity plate 6, so as to ensure that the cavity plate 6 can move smoothly and accurately during the injection molding process. The precision and stability of the mold are improved. A detachable core body 14 is provided on the top of the core fixing plate 5, and a cavity matching the core body 14 is provided inside the cavity plate 6, and the plastic material fills the cavity during the injection molding process and forms the final product shape. A heating cavity is also provided on the top of the cavity plate 6, and a detachable heating device is provided in the heating cavity, and the heating device heats the cavity before and after the injection molding to ensure that the residual materials will not solidify, thereby improving the production efficiency. By introducing the heating cavity and the detachable heating device, the problem of residual material solidification during the injection molding process is effectively solved. This design improves production efficiency.

[0028] A protrusion is also provided in the cavity at the top of the cavity plate 6. The heating device includes a protective shell 16. A coil 162 for heating is provided inside the protective shell 16. When the coil 162 is energized, the coil 162 generates an alternating magnetic field, which increases the temperature of the protrusion in the cavity plate 6. When the coil 162 is energized, the coil 162 generates an alternating magnetic field, which induces a current in the protrusion in the cavity plate 6, thereby generating heat and increasing the temperature of the protrusion. This heating method is called induction heating, which has the advantages of fast heating speed, high efficiency, and uniform heating. A plurality of clips 161 for fixing the coil 162 are also provided inside the protective shell 16. A temperature sensor for detecting temperature is also provided inside the cavity plate 6. The temperature sensor can monitor the temperature of the cavity plate 6 in real time to ensure that the heating process is carried out within a safe and controllable range. When the temperature reaches the preset value, the sensor will send a signal to control the heating device to stop working to prevent overheating from damaging the mold or product.

[0029] When the coil 162 is energized, the coil 162 will generate an alternating magnetic field. The heating chamber has a protrusion, which will generate eddy currents in the protrusions. The protrusions are heated by the eddy currents. Since it is a direct heating method, the heat conversion rate is particularly high, reaching up to 95%. Compared with traditional resistance heating methods, electromagnetic heating has higher thermal efficiency and can save 30% to 70% of electricity.

[0030] The protective housing 16 is also provided with a cable interface 163 for connecting a cable, and the cable interface 163 is stuck in the cavity plate 6. It is a cable used to connect the heating device (especially the coil 162) with an external power supply or control system. Through this interface, the current can be safely and reliably transmitted to the coil 162, thereby generating an alternating magnetic field and heating the protrusion in the cavity plate 6.

[0031] A flow channel 61 for material flow is provided on the protrusion in the cavity plate 6, a connecting plate 7 is provided on the top of the cavity plate 6, a second mounting plate 8 is provided on the top of the connecting plate 7, a through hole is provided at the center of the connecting plate 7 and the second mounting plate 8, and a material guide tube 15 is also provided in the through hole in the second mounting plate 8, the bottom end of the material guide tube 15 passes through the through hole in the connecting plate 7 and the second mounting plate 8 and is inserted into the flow channel 61 in the cavity plate 6, during the injection molding process, the plastic melt enters the flow channel 61 through the material guide tube 15, and then flows to the cavity for molding. The material guide tube 15 is usually made of high temperature resistant and corrosion resistant materials to ensure that it can withstand the scouring and corrosion of the high temperature melt during the injection molding process.

[0032] A cooling cavity 52 is also provided at the bottom of the core fixing plate 5. A cooling pipe 12 for cooling the product is provided in the cooling cavity 52, and a pipe interface 121 connected to the pipe is connected to the cooling pipe 12. The cooling pipe 12 is a crisscross pipe structure for increasing the cooling area. The crisscross pipe layout also helps to ensure that the coolant is evenly distributed in the cooling cavity 52, avoiding uneven cooling of the product and resulting in substandard product quality.

[0033] The coolant enters the cooling pipe 12 through the pipe interface 121 and circulates therein. Since the cooling pipe 12 is composed of crisscross pipes, the coolant can fully contact and remove the heat inside the product. As the coolant circulates, the product gradually cools and reaches the required hardness and dimensional stability. Finally, when the product is completely cooled, the mold can be opened and the product can be taken out.

[0034] A limiting member 13 for limiting and fixing the core body 14 is disposed at a position of the core fixing plate 5 close to the core body 14 , and one side of the limiting member 13 contacts the surface of the core body 14 .

[0035] A mounting seat 2 is fixed on both sides of the top of the first mounting plate 1, a first supporting plate 3 is fixed on the top of the mounting seat 2, a second supporting plate 4 is fixed on the top of the first supporting plate 3, and the top of the second supporting plate 4 is fixedly connected to the bottom of the core fixing plate 5, a first pushing plate 9 is fixed at the center position of the top of the mounting seat 2, a second pushing plate 10 is fixed on the top of the first pushing plate 9, a plurality of pushing rods 17 are arranged on the second pushing plate 10, the pushing rods 17 extend through the first supporting plate 3 and the second supporting plate 4 and extend into the core fixing plate 5, a plurality of reset rods 11 are also arranged on the second pushing plate 10, a reset spring 111 is sleeved on the reset rod 11, one end of the reset spring 111 is connected to the first supporting plate 3, and the other end of the reset spring 111 is connected to the second pushing plate 10.

[0036] During demoulding, the ejector device of the injection molding machine starts to work, pushing the first push plate 9 and the second push plate 10 forward. The first push plate 9 and the second push plate 10 push the push rod 17 to push the cooled and shaped product out of the mold, completing the demoulding process of the product.

[0037] Working principle: When using this mold for injection molding, first install the mold into the injection molding machine. The injection molding machine tightly combines the upper and lower mold parts of the mold through the mold closing action, and then the injection molding machine injects the molten material into the mold through the injection molding machine nozzle. The molten material is guided by the guide tube 15 and flows smoothly into the flow channel 61 inside the mold. Under the guidance of the flow channel 61, the molten material is evenly distributed between the core body 14 and the cavity, and the molten material is molded into the desired shape through the molding action of the mold. In order to accelerate the cooling and shaping of the molten material, coolant is introduced into the cooling pipe 12. The coolant circulates in the cooling pipe 12, taking away the heat of the core fixing plate 5 and its surroundings, so that the molten material is quickly cooled and solidified. When the injection molding is completed, the injection molding machine performs the mold opening action to separate the upper and lower mold parts of the mold. At this time, the ejector device of the injection molding machine starts to work, pushing the first push plate 9 and the second push plate 10 to move forward. The first push plate 9 and the second push plate 10 push the cooled and shaped product out of the mold by pushing the push rod 17, completing the demolding process of the product. During the mold closing process, in order to avoid cooling and clogging of the molten material in the flow channel 61, this mold adopts electromagnetic heating technology. By energizing the coil 162, the coil 162 will generate an alternating magnetic field. The protruding structure in the heating chamber generates eddy currents under the action of the magnetic field, and the eddy currents directly heat the protrusions. This direct heating method makes the heat conversion rate extremely high, up to 95%. Compared with the traditional resistance heating method, the thermal efficiency of electromagnetic heating is higher, and the power saving effect can reach 30% to 70%. Through electromagnetic heating technology, the cooling and clogging problem of the molten material in the flow channel 61 is effectively avoided, ensuring the smooth progress of injection molding.

[0038] The above embodiments only express one or several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the attached claims.

Claims

1. A plastic product injection molding mold for preventing residual material from solidifying, characterized in that: The invention comprises a first mounting plate (1), a core fixing plate (5), a cavity plate (6) and a connecting plate (7), wherein the four corners of the top of the core fixing plate (5) are fixed with guide rods (51), the cavity plate (6) is provided with guide holes, and the guide rods (51) are inserted into the guide holes in the cavity plate (6), a detachable core body (14) is provided at the top of the core fixing plate (5), a cavity matching the core body (14) is provided inside the cavity plate (6), a heating cavity is also provided at the top of the cavity plate (6), and a detachable heating device is provided in the heating cavity, a protrusion is also provided in the cavity at the top of the cavity plate (6), and the heating device comprises a protective shell (16), and a coil (162) for heating is provided inside the protective shell (16), and when the coil (162) is energized, the coil (162) generates an alternating magnetic field, so that the temperature of the protrusion in the cavity plate (6) increases.

2. The plastic product injection molding mold for preventing residual material from solidifying according to claim 1, characterized in that: A plurality of clamps (161) for fixing the coil (162) are also provided inside the protective shell (16), and a temperature sensor for detecting temperature is also provided inside the cavity plate (6).

3. The plastic product injection molding mold for preventing residual material from solidifying according to claim 2, characterized in that: The protective shell (16) is also provided with a cable interface (163) for connecting a cable, and the cable interface (163) is stuck in the cavity plate (6).

4. The plastic product injection molding mold for preventing residual material from solidifying according to claim 1, characterized in that: The protrusion in the cavity plate (6) is provided with a flow channel (61) for material flow, a connecting plate (7) is provided on the top of the cavity plate (6), a second mounting plate (8) is provided on the top of the connecting plate (7), through holes are provided at the center of the connecting plate (7) and the second mounting plate (8), a material guide tube (15) is also provided in the through hole in the second mounting plate (8), and the bottom end of the material guide tube (15) passes through the through holes in the connecting plate (7) and the second mounting plate (8) and is inserted into the flow channel (61) in the cavity plate (6).

5. The plastic product injection molding mold for preventing residual material from solidifying according to claim 1, characterized in that: The bottom of the core fixing plate (5) is also provided with a cooling cavity (52), a cooling pipe (12) for cooling the product is arranged in the cooling cavity (52), and a pipe interface (121) connected to a pipe is connected to the cooling pipe (12).

6. The plastic product injection molding mold for preventing residual material from solidifying according to claim 5, characterized in that: The cooling pipe (12) is a crisscrossed pipe structure used to increase the cooling area.

7. The plastic product injection molding mold for preventing residual material from solidifying according to claim 5, characterized in that: A position limiting member (13) for limiting and fixing the core body (14) is provided on the core fixing plate (5) at a position close to the core body (14); one side of the limiting member (13) is in contact with a surface of the core body (14).

8. The plastic product injection molding mold for preventing residual material from solidifying according to claim 1, characterized in that: A mounting seat (2) is fixed on both sides of the top of the first mounting plate (1); a first support plate (3) is fixed on the top of the mounting seat (2); a second support plate (4) is fixed on the top of the first support plate (3); the top of the second support plate (4) is fixedly connected to the bottom of the core fixing plate (5); a first push plate (9) is fixed at the center of the top of the mounting seat (2); a second push plate (10) is fixed on the top of the first push plate (9); a plurality of push rods (17) are provided on the second push plate (10); the push rods (17) extend through the first support plate (3) and the second support plate (4) and extend into the core fixing plate (5); a plurality of reset rods (11) are also provided on the second push plate (10); a reset spring (111) is sleeved on the reset rod (11); one end of the reset spring (111) is connected to the first support plate (3); and the other end of the reset spring (111) is connected to the second push plate (10).

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