Charging column multi-cavity injection molding equipment and mold thereof

Abstract

The invention relates to the technical field of multi-cavity injection molding, and particularly discloses charging column multi-cavity injection molding equipment and a mold thereof.The charging column multi-cavity injection molding equipment comprises an injection molding machine main body, and the injection molding machine main body comprises a fixed mold and a movable mold; the preheating mechanisms are located on the two sides of the fixed mold and comprise preheating holes fixedly connected with the outer wall of the fixed mold, and connecting cavities are formed in the inner wall of the fixed mold. The switching mechanism is located below the preheating hole and comprises a switching valve arranged in the preheating hole, the switching valve can switch the inflation temperature of the inflation nozzle, hot air is inflated into a cavity of the fixed mold and a cavity of the movable mold through the inflation nozzle of the preheating mechanism, the mold can be preheated through the hot air, and thermal stress generated by the temperature difference between the interior and the exterior of the mold can be reduced; and after injection molding is completed, cold air is introduced into the mold so that the mold can be rapidly cooled, the production period can be greatly shortened, the plastic charging column can reach the demolding temperature more rapidly, the overall production efficiency is improved, and the large-scale production requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-cavity injection molding, and specifically to a multi-cavity injection molding device and its mold for charging columns. Background Technique

[0002] The multi-cavity injection molding machine for charging columns is an injection molding device for producing charging column components. Through multi-cavity molds, multiple products can be produced simultaneously in one injection, significantly improving production efficiency, reducing costs, and ensuring the consistency of product quality. When the injection molding machine has multiple cavities in one mold, the number of mold cavities is large and the distribution is wide. The cavities at different positions are unevenly heated, resulting in different fluidity and filling effects of the molten plastic in different cavities. It is easy to have insufficient filling, leading to surface defects of the products, reducing production efficiency, and increasing production costs. Therefore, we propose a multi-cavity injection molding device and its mold for charging columns. Summary of the Invention

[0003] The purpose of the present invention is to provide a multi-cavity injection molding device and its mold for charging columns to solve the problems in the above background technique that the cavities at different positions are unevenly heated, resulting in different fluidity and filling effects of the molten plastic in different cavities, easy to have insufficient filling, leading to surface defects of the products, reducing production efficiency, and increasing production costs.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A multi-cavity injection molding device for charging columns, including an injection molding machine main body, and the injection molding machine main body includes a fixed mold and a moving mold; A preheating mechanism, the preheating mechanism is located on both sides of the fixed mold. The preheating mechanism includes preheating holes fixedly connected to the outer wall of the fixed mold. A connection cavity is opened on the inner wall of the fixed mold. The preheating holes are communicated with the connection cavity. An air injection nozzle is provided at one end of the preheating hole away from the fixed mold; A switching mechanism, the switching mechanism is located below the preheating hole. The switching mechanism includes a switching valve arranged inside the preheating hole, and the switching valve can switch the inflation temperature of the air injection nozzle.

[0005] Among them, the preheating mechanism includes two through holes opened on the inner wall of the preheating hole. One end of the air injection nozzle away from the preheating hole is fixedly connected with a hot air pipe and a cold air pipe respectively. The hot air pipe and the cold air pipe are respectively communicated with the injection molding machine main body.

[0006] Among them, the switching valve includes a positioning rod fixedly connected to the inner wall of the preheating hole. A switching plate is rotatably connected to the periphery of the positioning rod. The switching plate corresponds to the position of the through hole. The switching plate is located inside the preheating hole and is rotatably connected to the preheating hole. One end of the switching plate away from the positioning rod is fixedly connected with an arc-shaped plate. The arc-shaped plate is located outside the preheating hole. One end of the arc-shaped plate away from the switching plate is fixedly connected with a plurality of teeth.

[0007] Among them, a limiting rod is fixedly connected to the outer wall of the fixed mold. A rack is arranged around the limiting rod. A limiting groove is formed at one end of the rack close to the fixed mold. The limiting rod is located inside the limiting groove and is slidably connected to the limiting groove. The rack meshes with the teeth.

[0008] Among them, a telescopic rod is fixedly connected to one end of the rack away from the moving mold. A telescopic cylinder is slidably connected around the telescopic rod. An electromagnet I is fixedly connected to the inner wall of the telescopic cylinder. An electromagnet II is fixedly connected to the end of the telescopic rod. The electromagnet I and the electromagnet II are respectively connected to the inflating nozzle in an electric circuit. A spring is fixedly connected to one end of the telescopic cylinder away from the telescopic rod. One end of the spring away from the telescopic cylinder is fixedly connected to a fixing plate. The fixing plate is fixedly connected to the outer wall of the fixed mold.

[0009] Among them, an air outlet is formed at one end of the telescopic cylinder away from the telescopic rod. A temperature control valve is arranged inside the air outlet. A heat conducting pipe is fixedly connected between the preheating hole and the telescopic cylinder. The heat conducting pipe is respectively communicated with the preheating hole and the telescopic cylinder.

[0010] Among them, an air cavity is fixedly connected around the telescopic rod. A cold conducting pipe is fixedly connected between the preheating hole and the air cavity. The cold conducting pipe is respectively communicated with the preheating hole and the air cavity.

[0011] Among them, a pushing rod is fixedly connected to the outer wall of the moving mold. The pushing rod corresponds to the position of the rack.

[0012] Among them, an air suction machine is fixedly connected to the bottom of the fixed mold. The air suction machine is communicated with the connecting cavity. A temperature sensor is arranged inside the air suction machine. The temperature sensor is connected to the air suction machine in an electric circuit.

[0013] A multi-cavity injection mold for a charging column includes a fixed mold and a moving mold. After the fixed mold and the moving mold are closed, a switching mechanism is triggered by the pushing rod, and the connecting cavity is inflated through the inflating nozzle. After the moving mold and the fixed mold are closed, they are preheated by hot air; The hot air pipe introduces hot air into the telescopic cylinder. The telescopic rod is pushed out by the hot air. The electromagnet I and the electromagnet II are no longer in contact. The inflating nozzle introduces cold air into the connecting cavity; After the air suction machine monitors that the temperature of the connecting cavity decreases through the temperature sensor, the gas suction force on the connecting cavity is reduced. The air suction machine continuously sucks in to attract the molten plastic to the cavities of the fixed mold and the moving mold.

[0014] The present invention has at least the following beneficial effects: When the present invention is in use, hot air is filled into the cavities of the fixed mold and the moving mold through the air injection nozzle of the preheating mechanism. The hot air can preheat the mold, reduce the thermal stress generated by the temperature difference between the inside and outside of the mold, lower the risk of mold cracking, extend the service life of the mold. After injection molding, injecting cold air into the mold can quickly cool the mold, greatly shorten the production cycle, enable the plastic charging column to reach the demolding temperature faster, improve the overall production efficiency, and meet the requirements of large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the mold clamping state of the injection molding machine of the present invention; Figure 2 Schematic diagram of the mold opening state of the injection molding machine of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure of area A in Figure 4 Schematic diagram of the overall structure of the preheating mechanism of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure of area B in Figure 6 Schematic diagram of the overall structure of the fixed mold of the present invention; Figure 7 Schematic diagram of the structure of the present invention after removing the air injection nozzle; Figure 8 Schematic diagram of the internal structure of the preheating hole of the present invention; Figure 9 Schematic diagram of the inner side structure of the fixed mold of the present invention; Figure 10 For the present invention Figure 9 Schematic diagram of the enlarged structure of area C in Figure 11 For the present invention Figure 9 Schematic diagram of the enlarged structure of area D in Figure 12 Schematic diagram of the sectional structure of the fixing plate of the present invention; Figure 13 Schematic diagram of the sectional structure of the telescopic cylinder of the present invention.

[0016] In the figure: 1. Main body of the injection molding machine; 11. Fixed mold; 12. Moving mold; 2. Preheating mechanism; 21. Preheating holes; 22. Connecting cavity; 23. Inflatable nozzle; 24. Through holes; 25. Hot air pipe; 26. Cold air pipe; 3. Switching mechanism; 31. Switching valve; 32. Positioning rod; 33. Switching plate; 34. Arc-shaped plate; 35. Teeth; 36. Limiting rod; 37. Rack; 38. Limiting groove; 39. Telescopic rod; 310. Telescopic cylinder; 311. Electromagnet I; 312. Electromagnet II; 313. Spring; 314. Fixed plate; 315. Air outlet hole; 316. Temperature control valve; 317. Heat conduction pipe; 318. Air cavity; 319. Cold conduction pipe; 320. Push rod; 4. Air suction machine; 41. Temperature sensor. Detailed implementation mode

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1 Please refer to Figures 1-13 , the present invention provides a technical solution: a multi-cavity injection molding device for charging columns, including a main body 1 of the injection molding machine, and the main body 1 of the injection molding machine includes a fixed mold 11 and a moving mold 12; A preheating mechanism 2, the preheating mechanism 2 is located on both sides of the fixed mold 11, and the preheating mechanism 2 includes preheating holes 21 fixedly connected to the outer wall of the fixed mold 11, a connecting cavity 22 is opened on the inner wall of the fixed mold 11, the preheating holes 21 are communicated with the connecting cavity 22, and an inflatable nozzle 23 is provided at one end of the preheating hole 21 away from the fixed mold 11; A switching mechanism 3, the switching mechanism 3 is located below the preheating hole 21, and the switching mechanism 3 includes a switching valve 31 arranged inside the preheating hole 21, and the switching valve 31 can switch the inflation temperature of the inflatable nozzle 23; When the present invention is in use, hot air is filled into the cavities of the fixed mold 11 and the moving mold 12 through the inflatable nozzle 23 of the preheating mechanism 2. The hot air can preheat the mold, reduce the thermal stress generated due to the temperature difference between the inside and outside of the mold, reduce the risk of mold cracking, and extend the service life of the mold. After injection molding, introducing cold air into the mold can quickly cool the mold, greatly shorten the production cycle, enable the plastic charging column to reach the demolding temperature faster, improve the overall production efficiency, and meet the requirements of large-scale production.

[0019] The preheating mechanism 2 includes two through holes 24 opened on the inner wall of the preheating hole 21. One end of the inflatable nozzle 23 away from the preheating hole 21 is fixedly connected with a hot air pipe 25 and a cold air pipe 26 respectively, and the hot air pipe 25 and the cold air pipe 26 are respectively communicated with the main body 1 of the injection molding machine; After the moving mold 12 and the fixed mold 11 are clamped, the inflation nozzle 23 is triggered to be powered on through the switching mechanism 3. The inflation nozzle 23 inflates the inside of the preheating hole 21 through the hot air pipe 25. The hot air enters the connection cavity 22 through the through hole 24. The hot air can inflate the cavity after the fixed mold 11 and the moving mold 12 are clamped. The hot air can preheat the mold. The preheated mold can increase the temperature of the inner cavity of the mold, enhance the melt filling ability, facilitate the injection molding of thin-walled and complex structure parts, reduce the injection pressure, reduce the mold wear and energy consumption. At the same time, it can ensure that the cooling speed of each part of the product is consistent, avoid defects such as shrinkage holes and warping, and improve the quality of the product.

[0020] The switching valve 31 includes a positioning rod 32 fixedly connected to the inner wall of the preheating hole 21. A switching plate 33 is rotatably connected to the periphery of the positioning rod 32. The switching plate 33 corresponds to the position of the through hole 24. The switching plate 33 is located inside the preheating hole 21 and is rotatably connected to the preheating hole 21. One end of the switching plate 33 away from the positioning rod 32 is fixedly connected with an arc plate 34. The arc plate 34 is located outside the preheating hole 21. One end of the arc plate 34 away from the switching plate 33 is fixedly connected with a plurality of teeth 35; Among them, a limiting rod 36 is fixedly connected to the outer wall of the fixed mold 11. A rack 37 is arranged on the periphery of the limiting rod 36. A limiting groove 38 is opened at one end of the rack 37 close to the fixed mold 11. The limiting rod 36 is located inside the limiting groove 38 and is slidably connected to the limiting groove 38. The rack 37 is engaged with the teeth 35; A push rod 320 is fixedly connected to the outer wall of the moving mold 12. The push rod 320 corresponds to the position of the rack 37; When the moving mold 12 is closed with the stationary mold 11, the moving mold 12 drives the push rod 320 to approach the stationary mold 11. The push rod 320 pushes the rack 37 to slide. The limiting rod 36 located inside the limiting groove 38 opened on the rack 37 slides inside the limiting groove 38, which can ensure the horizontal sliding of the rack 37. When the rack 37 slides, it can drive the switching plate 33 to rotate around the positioning rod 32 through the teeth 35. At this time, the switching plate 33 rotates to the other side, and at the same time, the switching plate 33 switches to the through hole 24 on the other side. At this time, the hot air can enter the connection cavity 22 through the through hole 24. Since one end of the rack 37 far from the moving mold 12 is fixedly connected with a telescopic rod 39, the outer periphery of the telescopic rod 39 is slidably connected with a telescopic cylinder 310. An electromagnet 311 is fixedly connected to the inner wall of the telescopic cylinder 310, and an electromagnet 312 is fixedly connected to the end of the telescopic rod 39. The electromagnet 311 and the electromagnet 312 are respectively electrically connected to the inflatable nozzle 23. One end of the spring 313 far from the telescopic cylinder 310 is fixedly connected with a fixing plate 314, and the fixing plate 314 is fixedly connected to the outer wall of the stationary mold 11. When the rack 37 slides, it can drive the telescopic rod 39 to slide inside the telescopic cylinder 310. At this time, the electromagnet 312 fixedly connected to the telescopic rod 39 contacts the electromagnet 311, and the inflatable nozzle 23 is powered on. The inflatable nozzle 23 injects the hot air inside the hot air pipe 25 into the connection cavity 22. Controlling the inflation nozzle 23 to spray gas through mold closing can reduce manual intervention, accurately and timely inject the hot air in the hot air pipe 25 into the connection cavity 22, meet the temperature requirements of the mold in a specific process stage, improve production efficiency, ensure product quality, and realize the automatic control of the production process.

[0021] An air outlet hole 315 is opened at one end of the telescopic cylinder 310 far from the telescopic rod 39. A temperature control valve 316 is arranged inside the air outlet hole 315. A heat conduction pipe 317 is fixedly connected between the preheating hole 21 and the telescopic cylinder 310. The heat conduction pipe 317 is respectively communicated with the preheating hole 21 and the telescopic cylinder 310; Wherein, an air cavity 318 is fixedly connected to the outer periphery of the telescopic rod 39. A cold conduction pipe 319 is fixedly connected between the preheating hole 21 and the air cavity 318. The cold conduction pipe 319 is respectively communicated with the preheating hole 21 and the air cavity 318; When hot air is filled into the inflatable nozzle 23, a part of the hot air inside the preheating hole 21 enters the inside of the telescopic cylinder 310 through the heat conduction pipe 317. The temperature of the temperature control valve 316 inside the telescopic cylinder 310 rises, and the temperature control valve 316 blocks the air outlet hole 315. When hot air continues to be introduced into the telescopic cylinder 310, since the rack 37 at one end of the telescopic rod 39 is continuously squeezed by the push rod 320, the gas inside the telescopic cylinder 310 increases, and the gas pushes the telescopic cylinder 310 towards the spring 313. At this time, the spring 313 is compressed. During the sliding process of the telescopic cylinder 310, the electromagnet one 311 and the electromagnet two 312 on the inner wall of the telescopic cylinder 310 slide until the electromagnet one 311 and the electromagnet two 312 no longer contact each other. At this time, the inflatable nozzle 23 stops filling hot air, which means that the mold preheating is completed. When the injection molding machine main body 1 injects plastic into the mold, the molten plastic can slide smoothly inside the mold cavity, avoiding uneven cooling of the molten plastic caused by the over-cooled mold and the appearance of air holes, helping to improve the quality stability of the injection molded products, reducing the defective rate, optimizing the production process, and enhancing the overall production efficiency.

[0022] A suction machine 4 is fixedly connected to the bottom of the fixed mold 11. The suction machine 4 is communicated with the connection cavity 22. A temperature sensor 41 is arranged inside the suction machine 4, and the temperature sensor 41 is electrically connected to the suction machine 4; when the inflatable nozzle 23 fills the mold with hot air, the temperature sensor 41 inside the suction machine 4 detects a temperature rise. At this time, the suction machine 4 is powered on. The suction machine 4 located below the fixed mold 11 can suck the hot air above the fixed mold 11 downward, making the hot air flow evenly and filling the entire mold cavity, so that the mold is preheated evenly. In addition, the suction machine 4 can absorb the excess gas inside the mold and play a guiding role for the hot air, reducing the local overheating or overcooling phenomenon caused by uneven gas distribution, further avoiding product defects, improving the injection molding production efficiency and product quality stability, and reducing production costs and defective rates.

[0023] After the injection molding is completed, the mold is filled with molten plastic. The suction machine 4 stops sucking air. At the same time, the inflatable nozzle 23 fills cold air. The cold air enters the mold through the connection cavity 22, which can accelerate the cooling of the mold and the product, control the crystallinity and shrinkage rate of the product, reduce defects such as deformation and cracking caused by uneven cooling, and improve the dimensional accuracy and surface quality of the product. In addition, part of the cold air enters the air cavity 318 outside the telescopic rod 39 through the cold conduction pipe 319. Filling cold air inside the air cavity 318 can cool the inside of the telescopic cylinder 310, reduce the temperature of the temperature control valve 316 and open it. The air pressure inside the telescopic cylinder 310 is balanced, which is convenient for the switching plate 33 to drive the rack 37 to slide through the teeth 35, and the spring 313 can reset to eject the telescopic cylinder 310, facilitating the next push rod 320 to push the rack 37.

[0024] Working principle and usage process of the present invention: After the moving mold 12 and the fixed mold 11 are clamped, the inflation nozzle 23 is triggered to be powered on through the switching mechanism 3. The inflation nozzle 23 inflates the inside of the preheating hole 21 through the hot air pipe 25. The hot air enters the connection cavity 22 through the through hole 24. The hot air can inflate the cavity after the fixed mold 11 and the moving mold 12 are clamped, and the hot air can preheat the mold. When the moving mold 12 and the fixed mold 11 are clamped, the moving mold 12 drives the push rod 320 to approach the fixed mold 11. The push rod 320 pushes the rack 37 to slide. The limiting rod 36 located inside the limiting groove 38 opened on the rack 37 slides inside the limiting groove 38, which can ensure the horizontal sliding of the rack 37. When the rack 37 slides, it can drive the switching plate 33 to rotate around the positioning rod 32 through the teeth 35. At this time, the switching plate 33 rotates to the other side, and at the same time, the switching plate 33 switches to the through hole 24 on the other side. At this time, the hot air can enter the connection cavity 22 through the through hole 24. When the rack 37 slides, it can drive the telescopic rod 39 to slide inside the telescopic cylinder 310. At this time, the electromagnet two 312 fixedly connected to the telescopic rod 39 contacts the electromagnet one 311, and the inflation nozzle 23 is powered on. The inflation nozzle 23 injects the hot air inside the hot air pipe 25 into the connection cavity 22. When the inflation nozzle 23 injects the hot air, part of the hot air inside the preheating hole 21 enters the telescopic cylinder 310 through the heat conduction pipe 317. The temperature of the temperature control valve 316 inside the telescopic cylinder 310 rises, and the temperature control valve 316 blocks the air outlet hole 315. When the hot air continues to be injected into the telescopic cylinder 310, since the rack 37 at one end of the telescopic rod 39 is continuously squeezed by the push rod 320, the gas inside the telescopic cylinder 310 increases, and the gas pushes the telescopic cylinder 310 towards the spring 313. At this time, the spring 313 is compressed. During the sliding process of the telescopic cylinder 310, the electromagnet one 311 and the electromagnet two 312 on the inner wall of the telescopic cylinder 310 slide until the electromagnet one 311 and the electromagnet two 312 no longer contact. At this time, the inflation nozzle 23 stops injecting the hot air, which means the mold preheating is completed. When the inflation nozzle 23 injects the hot air into the mold, the temperature sensor 41 inside the air suction machine 4 detects the temperature rise. At this time, the air suction machine 4 is powered on. The air suction machine 4 located below the fixed mold 11 can suck the hot air above the fixed mold 11 below. After the injection molding is completed, the mold is filled with molten plastic, and the air suction machine 4 stops sucking. At the same time, the inflation nozzle 23 injects cold air. The cold air enters the mold through the connection cavity 22, which can accelerate the cooling of the mold and the product. In addition, part of the cold air enters the air cavity 318 outside the telescopic rod 39 through the cold conduction pipe 319. Filling the air cavity 318 with cold air can cool the inside of the telescopic cylinder 310, reduce the temperature of the temperature control valve 316 and open it. The air pressure inside the telescopic cylinder 310 is balanced, which is convenient for the switching plate 33 to drive the rack 37 to slide through the teeth 35, and the spring 313 can reset to eject the telescopic cylinder 310, which is convenient for the next push rod 320 to push the rack 37.

[0025] Embodiment 2 A multi-cavity injection mold for a charging column, comprising a fixed mold 11 and a movable mold 12. After the fixed mold 11 and the movable mold 12 are clamped, the switching mechanism 3 is triggered by a push rod 320, and the connecting cavity 22 is inflated through an air injection nozzle 23. After the movable mold 12 and the fixed mold 11 are clamped, they are preheated by hot air. The hot air pipe 25 introduces hot air into the inside of the telescopic cylinder 310, and the telescopic rod 39 is pushed out by the hot air. The electromagnet 311 and the electromagnet 312 are no longer in contact, and the air injection nozzle 23 injects cold air into the connecting cavity 22. After the suction machine 4 monitors that the temperature of the connecting cavity 22 decreases through the temperature sensor 41, the gas suction force on the connecting cavity 22 is reduced, and the suction machine 4 continuously sucks to attract the molten plastic to the cavities of the fixed mold 11 and the movable mold 12.

[0026] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-cavity injection molding device for a charging column, comprising: An injection molding machine main body (1), the injection molding machine main body (1) includes a fixed mold (11) and a movable mold (12); It is characterized in that it further includes: A preheating mechanism (2), the preheating mechanism (2) is located on both sides of the fixed mold (11), the preheating mechanism (2) includes a preheating hole (21) fixedly connected to the outer wall of the fixed mold (11), a connection cavity (22) is opened on the inner wall of the fixed mold (11), the preheating hole (21) is communicated with the connection cavity (22), and an air injection nozzle (23) is provided at one end of the preheating hole (21) away from the fixed mold (11); A switching mechanism (3), the switching mechanism (3) is located below the preheating hole (21), the switching mechanism (3) includes a switching valve (31) arranged inside the preheating hole (21), and the switching valve (31) can switch the inflation temperature of the air injection nozzle (23).

2. The multi-cavity injection molding device for charging columns according to claim 1, characterized in that: The preheating mechanism (2) includes two through holes (24) opened on the inner wall of the preheating hole (21), a hot air pipe (25) and a cold air pipe (26) are respectively fixedly connected to one end of the air injection nozzle (23) away from the preheating hole (21), and the hot air pipe (25) and the cold air pipe (26) are respectively communicated with the injection molding machine main body (1).

3. The multi-cavity injection molding device for charging columns according to claim 1, wherein: The switching valve (31) includes a positioning rod (32) fixedly connected to the inner wall of the preheating hole (21), a switching plate (33) is rotatably connected to the periphery of the positioning rod (32), the switching plate (33) corresponds to the position of the through hole (24), the switching plate (33) is located inside the preheating hole (21) and is rotatably connected to the preheating hole (21), an arc plate (34) is fixedly connected to one end of the switching plate (33) away from the positioning rod (32), the arc plate (34) is located outside the preheating hole (21), and a plurality of teeth (35) are fixedly connected to one end of the arc plate (34) away from the switching plate (33).

4. The multi-cavity injection molding device for charging columns according to claim 3, wherein: A limiting rod (36) is fixedly connected to the outer wall of the fixed mold (11), a rack (37) is arranged on the periphery of the limiting rod (36), a limiting groove (38) is opened at one end of the rack (37) close to the fixed mold (11), the limiting rod (36) is located inside the limiting groove (38) and is slidably connected to the limiting groove (38), and the rack (37) is engaged with the teeth (35).

5. The multi-cavity injection molding device for charging columns according to claim 4, characterized in that: One end of the rack (37) away from the movable mold (12) is fixedly connected with a telescopic rod (39), a telescopic cylinder (310) is slidably connected to the periphery of the telescopic rod (39), an electromagnet one (311) is fixedly connected to the inner wall of the telescopic cylinder (310), an electromagnet two (312) is fixedly connected to the end of the telescopic rod (39), the electromagnet one (311) and the electromagnet two (312) are respectively electrically connected to the air injection nozzle (23), a spring (313) is fixedly connected to one end of the telescopic cylinder (310) away from the telescopic rod (39), and a fixing plate (314) is fixedly connected to one end of the spring (313) away from the telescopic cylinder (310), and the fixing plate (314) is fixedly connected to the outer wall of the fixed mold (11).

6. The multi-cavity injection molding equipment for charging columns according to claim 5, wherein: An air outlet hole (315) is formed at one end of the telescopic cylinder (310) far away from the telescopic rod (39). A temperature control valve (316) is arranged inside the air outlet hole (315). A heat conduction pipe (317) is fixedly connected between the preheating hole (21) and the telescopic cylinder (310). The heat conduction pipe (317) is respectively communicated with the preheating hole (21) and the telescopic cylinder (310).

7. The multi-cavity injection molding device for charging columns according to claim 6, wherein: An air cavity (318) is fixedly connected to the periphery of the telescopic rod (39). A cold conduction pipe (319) is fixedly connected between the preheating hole (21) and the air cavity (318). The cold conduction pipe (319) is respectively communicated with the preheating hole (21) and the air cavity (318).

8. The multi-cavity injection molding device for charging columns according to claim 4, characterized in that: A push rod (320) is fixedly connected to the outer wall of the moving mold (12). The push rod (320) corresponds to the position of the rack (37).

9. The multi-cavity injection molding equipment for charging columns according to claim 1, wherein: An air suction machine (4) is fixedly connected to the bottom of the fixed mold (11). The air suction machine (4) is communicated with the connection cavity (22). A temperature sensor (41) is arranged inside the air suction machine (4). The temperature sensor (41) is electrically connected to the air suction machine (4).

10. A multi-cavity injection mold for a charging post, which is used in cooperation with the charging post multi-cavity injection equipment described in claims 1-9, and is characterized in that: It includes a fixed mold (11) and a moving mold (12). After the fixed mold (11) and the moving mold (12) are closed, the switching mechanism (3) is triggered by the push rod (320), and the connection cavity (22) is inflated through the inflation nozzle (23). After the moving mold (12) and the fixed mold (11) are closed, they are preheated by hot air; The hot air pipe (25) introduces hot air into the telescopic cylinder (310). The telescopic rod (39) is pushed out by the hot air. The electromagnet one (311) and the electromagnet two (312) are no longer in contact. The inflation nozzle (23) introduces cold air into the connection cavity (22); After the air suction machine (4) monitors that the temperature of the connection cavity (22) decreases through the temperature sensor (41), the gas suction force on the connection cavity (22) is reduced. The air suction machine (4) continuously sucks and attracts the molten plastic to the cavities of the fixed mold (11) and the moving mold (12).

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