Cooling Device and Method in Injection Molding of Automotive Plastic Parts

Abstract

The present invention discloses a cooling device and method in the injection molding of automotive plastic parts, belonging to the technical field of injection molding cooling. It includes an injection molding machine frame, a fixed template, a movable template, a cooling unit, and a mold clamping and propulsion unit. The fixed template is vertically fixed on one side of the upper end face of the injection molding machine frame, and the mold clamping and propulsion unit is horizontally fixed on the other side of the upper end face of the injection molding machine frame. The output end of the mold clamping and propulsion unit is connected to the movable template; the cooling unit is fixed on the end face of the movable template away from the fixed template; the cooling unit includes a cooling plate, which is assembled in parallel on the movable template, and a plurality of cooling columns are evenly distributed on one side of the cooling plate; in the present invention, a plurality of cooling columns can be independently controlled for rapid cooling at relevant positions, so as to perform precise rapid cooling and temperature reduction for special molding parts to ensure that these key areas reach the required cooling temperature; and the cooling plate can also perform overall cooling and adjust the cooling direction according to the molding requirements of the parts, further improving the cooling effect.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding cooling, and in particular relates to a cooling device and a method for injection molding of automobile plastic parts. Background Art

[0002] Injection molding is a production technology widely used in automobile manufacturing, especially for mass production of plastic parts with complex shapes and high precision requirements. The process injects molten plastic material into the mold cavity, cools and solidifies in the mold to form the desired parts;

[0003] The cooling stage is a key link in the injection molding process, which directly affects product quality, production efficiency and cost control. At present, in the injection molding of automotive parts, the common cooling method is to use circulating water to take away the heat of the mold to achieve rapid cooling. However, although this one-time cooling method has a strong overall cooling effect, it still maintains a high temperature for special molding parts due to insufficient cooling, resulting in continued shrinkage or incomplete solidification of the material in this area.

[0004] These parts are prone to warping, distortion or shape changes, affecting the overall dimensional accuracy and assembly performance of the parts.

[0005] Therefore, it is necessary to provide a cooling device and method for the injection molding of automobile plastic parts to solve the problems raised in the above background technology. Summary of the invention

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a cooling device for injection molding of automobile plastic parts, comprising an injection molding frame, a fixed mold plate, a movable mold plate, a cooling unit and a mold clamping and pushing unit, wherein the fixed mold plate is vertically fixed to one side of the upper end surface of the injection molding frame, the movable mold plate is arranged parallel to the fixed mold plate and is slidably mounted with the injection molding frame, the mold clamping and pushing unit is horizontally fixed to the other side of the upper end surface of the injection molding frame, and the output end of the mold clamping and pushing unit is connected to the movable mold plate;

[0007] The cooling unit is fixed to an end surface of the movable platen away from the fixed platen;

[0008] The cooling unit includes a cooling plate, which is assembled in parallel on the moving template. A plurality of cooling columns are evenly distributed on one side of the cooling plate, and guide grooves corresponding to the cooling columns are opened in the moving template. A guide plate is fixed on the other side of the cooling plate, and a cooling pipe is horizontally fixed in the middle of the guide plate. One end of the cooling pipe is slidably connected to the mold pushing unit.

[0009] Preferably, a liquid inlet pipe and a liquid discharge pipe are fixed inside the flow guide plate. A plurality of first branch pipes are connected to the liquid inlet pipe, and a plurality of second branch pipes are connected to the liquid discharge pipe. The other ends of the first branch pipes and the second branch pipes are connected to the respective cooling columns;

[0010] A coolant delivery pipe and a hot oil pipe are connected to the outside of the liquid inlet pipe through a tee joint.

[0011] Preferably, a heat transfer sleeve is coaxially and slidably sleeved at one end of the cooling column. An inner flow pipe is arranged at the center inside the heat transfer sleeve, and a guide cavity is formed inside the cooling column. Through holes are arranged on the side wall of the inner flow pipe located in the guide cavity, and the second branch pipe is connected to the guide cavity;

[0012] A valve plug is fixed on the side wall of the inner flow pipe, and a valve ring is fixed inside the cooling column. The valve plug is slidably matched with the valve ring, and a shaft rod is slidably connected inside the cooling column.

[0013] Preferably, an electromagnetic driver is fixed at the other end of the cooling column, and a magnetic piston is fixed at the end of the shaft rod; a compression spring is connected to one side of the magnetic piston.

[0014] Preferably, the inner flow pipe is rotatably connected to the heat transfer sleeve. A plurality of needle points are distributed on the side wall of the heat transfer sleeve, and a flow disturbance sleeve is sleeved at one end of the inner flow pipe located inside the heat transfer sleeve;

[0015] A guide ring is fixed inside the cooling column. An inclined groove is formed on the side wall of the guide ring. A connecting shaft is rotatably connected to the shaft rod. The inner flow pipe is fixed to the connecting shaft. A pin is fixed on the side wall of the connecting shaft, and the pin is arranged to slide along the inclined groove.

[0016] Preferably, a plurality of fine channels are circumferentially distributed on the outer wall of the heat transfer sleeve, and the cross section of each fine channel is in a U-shaped structure;

[0017] The outer wall of the heat transfer sleeve is in sliding and sealing contact with the guide groove, and heat transfer oil is pre-filled between the heat transfer sleeve and the guide groove;

[0018] Direct current holes are formed on the side wall of the heat transfer sleeve at the positions of the respective fine channels. A hole cavity is formed in the middle of the lower end face of the heat transfer sleeve, and the respective direct current holes are connected to the hole cavity;

[0019] A sealing disc is fixed in the guide groove. The sealing disc is slidably connected to the hole cavity. A partition disc is fixed at the port of the hole cavity, and a plurality of one-way discharge holes are formed on the partition disc.

[0020] Preferably, the heat transfer sleeve axially reciprocates under the push of the electromagnetic force of the electromagnetic driver.

[0021] Preferably, a cooling channel is provided in the middle of the cooling plate, and one end of the cooling pipe is connected to the cooling channel;

[0022] The area of the cooling plate outside the cooling channel is evenly divided into a plurality of flow chambers, and a plurality of runoff plates are arranged and fixed in each flow chamber. The cross-section of the runoff plate is in an arc structure, and a plurality of radial holes are provided on the runoff plate;

[0023] A diversion plate is fixed between the runoff plates.

[0024] Preferably, a plurality of fixing holes are provided on the outer side wall of the cooling plate, and an outer pipe group is hermetically connected outside each fixing hole. An inlet pipe and an outlet pipe are connected to each outer pipe group.

[0025] Preferably, a cooling method for injection molding of automotive plastic parts includes the following steps:

[0026] S1. Mold closing and injection molding. The molten plastic enters the injection molding machine through the hopper. The moving template approaches the fixed template under the drive of the mold closing propulsion unit and completes the mold closing; high-temperature hot oil is conveyed to each cooling column through the inlet pipe to preheat the moving template. Then, the molten plastic is injected into the mold cavity through the injection molding machine. After being completely filled, a certain pressure is maintained to make the plastic evenly distributed and preliminarily compacted;

[0027] S2. Rapid cooling. According to the special molding positions of the formed automotive parts, such as ribs and support structures, the corresponding cooling columns perform rapid cooling and temperature reduction on them. Among them, the coolant enters the cooling columns through the corresponding inlet pipes. The valve plugs and valve rings on the inner flow pipes of the corresponding cooling columns are controlled by the electromagnetic driver to be separated from each other, and the coolant flows out from the end of the inner flow pipe to achieve circulation; at the same time, the electromagnetic driver controls the inner flow pipe to perform high-frequency reciprocating displacement, and the heat transfer sleeve can slide synchronously with the inner flow pipe, so that the heat-conducting oil fully flows in each fine channel of the heat transfer sleeve, and the heat is quickly taken away by the coolant flowing inside the cooling column, so that these areas are quickly cooled, preliminarily shaped and the thermal stress is reduced;

[0028] S3. Overall cooling. The cooling columns stop cooling operations. According to the cooling and forming requirements of the parts, a step-by-step cooling method from the center to the outside or from the outside to the center is adopted. The coolant enters the cooling plate and fully diffuses and flows in the flow chamber to ensure uniform cooling and avoid stress concentration caused by excessive cooling. After reaching the predetermined cooling time, the cooling system is turned off;

[0029] S4. The mold closing propulsion unit moves in the reverse direction, so that the moving template and the fixed template are separated, and the formed plastic parts are taken out.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] In the present invention, on the one hand, the cooling plate can achieve the overall cooling of the moving template. On the other hand, multiple cooling columns distributed on its end face can be independently controlled to perform rapid cooling at relevant positions, so as to perform precise rapid cooling and temperature reduction for special molding parts during the injection molding cooling process, ensuring that these key areas reach the required cooling temperature. Among them, the cooling plate is evenly divided into multiple flow chambers, and a runoff plate is arranged in each flow chamber. Multiple outer tube groups are distributed outside the cooling plate. Thus, during the overall cooling process, coolant can be transported into the cooling plate through each outer tube group to achieve gradual cooling from the outside to the center, and coolant can also be transported into the cooling plate through the cooling channels to achieve gradual cooling from the center to the outside. This can not only ensure the uniform distribution of the coolant inside the cooling plate, but also adjust the cooling direction according to the molding requirements of the parts, reduce the cooling blind area, and further improve the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 is Figure 1 an enlarged schematic diagram of the structure at A in

[0034] Figure 3 is a schematic diagram of the structure of the cooling plate and the cooling columns in the present invention;

[0035] Figure 4 is a schematic diagram of the structure of the cooling unit in the present invention;

[0036] Figure 5 is a schematic diagram of the internal structure of the cooling column in the present invention;

[0037] Figure 6 is Figure 5 an enlarged schematic diagram of the structure at B in

[0038] Figure 7 is a schematic diagram of the structure of the heat transfer sleeve in the present invention;

[0039] Figure 8 is a cross-sectional view of the cooling plate in the present invention.

[0040] In the figure: 1, injection molding machine frame; 11, fixed template; 12, moving template; 13, mold closing propulsion unit; 14, guide groove; 2, cooling unit; 21, diversion plate; 22, cooling pipe; 23, liquid inlet pipe; 24, liquid discharge pipe; 3, cooling plate; 31, cooling channel; 32, runoff plate; 33, radial hole; 34, drainage plate; 35, fixing hole; 36, outer pipe group; 37, inlet through pipe; 38, discharge through pipe; 4, cooling column; 41, inner flow pipe; 42, guide cavity; 43, valve plug; 44, connecting shaft; 45, shaft rod; 46, electromagnetic driver; 47, guide ring; 5, heat transfer sleeve; 51, needle point; 52, turbulence sleeve; 53, thin channel; 54, direct current hole; 55, hole cavity; 56, sealing plate; 57, one-way discharge hole. Specific implementation manner

[0041] Please refer to Figures 1-8 , in the embodiment of the present invention, for the cooling device in the injection molding of automotive plastic parts, it includes an injection molding machine frame 1, a fixed template 11, a moving template 12, a cooling unit 2 and a mold closing propulsion unit 13. The fixed template 11 is vertically fixed on one side of the upper end surface of the injection molding machine frame 1. The moving template 12 is arranged parallel to the fixed template 11 and is slidably installed on the injection molding machine frame 1. The moving template 12 can be hermetically and slidably assembled with the fixed template 11 to form a sealed injection cavity for automotive parts. On the other side of the upper end surface of the injection molding machine frame 1, the mold closing propulsion unit 13 is horizontally fixed. The output end of the mold closing propulsion unit 13 is connected to the moving template 12. The mold closing propulsion unit 13 is mainly used to provide a driving force for the horizontal displacement of the moving template 12;

[0042] The cooling unit 2 is fixed on the end surface of the moving template 12 away from the fixed template 11;

[0043] The cooling unit 2 includes a cooling plate 3, which is assembled in parallel on the moving template 12 and can be closely assembled with the cooling plate 3 so that heat can be quickly transferred from the moving template 12 to the cooling plate 3, and then the heat is taken away by the coolant in the cooling plate 3. A plurality of cooling columns 4 are evenly distributed on one side of the cooling plate 3. Guide grooves 14 corresponding to the cooling columns 4 one by one are formed in the moving template 12, and the cooling columns 4 can be inserted and assembled in the guide grooves 14 one by one. A diversion plate 21 is fixed on the other side of the cooling plate 3. A cooling pipe 22 is horizontally fixed in the middle of the diversion plate 21. One end of the cooling pipe 22 slidably penetrates through the mold closing propulsion unit 13, and the cooling pipe 22 is connected to an external liquid supply pump to pump the coolant into the cooling plate 3 through the cooling pipe 22.

[0044] In this embodiment, a liquid inlet pipe 23 and a liquid discharge pipe 24 are fixed inside the flow guide plate 21. A plurality of first branch pipes are connected to the liquid inlet pipe 23, and a plurality of second branch pipes are connected to the liquid discharge pipe 24. The other ends of the first branch pipes and the second branch pipes are connected to the respective cooling columns 4. Therefore, the liquid inlet pipe 23 can transport the coolant to each cooling column 4 through the respective first branch pipes. After the coolant circulates, it is centrally discharged into the liquid discharge pipe 24 through the second branch pipes.

[0045] A coolant delivery pipe and a hot oil pipe are connected to the outside of the liquid inlet pipe 23 through a tee joint (not shown in the figure). The coolant delivery pipe and the cooling pipeline 22 are independently arranged, and they can transport coolants at different temperatures respectively. The hot oil pipe is mainly used to provide high-temperature hot oil, so that the moving template 12 can be internally preheated through the respective cooling columns 4 at the initial stage of injection molding, so that the moving template 12 can reach the working temperature faster, improving the flow performance of the molten plastic in the injection cavity and reducing defects such as bubbles and shrinkage cavities that may occur during the mold filling process.

[0046] As a preferred embodiment, a heat transfer sleeve 5 is coaxially and slidably sleeved at one end of the cooling column 4. An inner flow pipe 41 is centrally arranged inside the heat transfer sleeve 5, and a guide cavity 42 is formed inside the cooling column 4. Through holes are provided on the side wall of the inner flow pipe 41 located inside the guide cavity 42, and the second branch pipe is connected to the guide cavity 42. The coolant can flow into the heat transfer sleeve 5 after entering the cooling column 4, and then enter the guide cavity 42 through the through holes of the inner flow pipe 41, and then be discharged by the second branch pipe outside the guide cavity 42, realizing the circulation of the coolant.

[0047] A valve plug 43 is fixed on the side wall of the inner flow pipe 41, and a valve ring is fixed inside the cooling column 4. The valve plug 43 is slidably matched with the valve ring. A shaft rod 45 is slidably connected inside the cooling column 4. When the valve plug 43 is in sealing cooperation with the valve ring, the coolant cannot flow into the cooling column 4 for circulation, thereby realizing the independent adjustment of each cooling column 4, so that the cooling column 4 at the corresponding position can be controlled to cool the moving template 12 during the cooling and forming process.

[0048] In this embodiment, an electromagnetic driver 46 is fixed at the other end of the cooling column 4, and a magnetic piston is fixed at the end of the shaft rod 45. A compression spring is connected to one side of the magnetic piston. Under the action of the elastic force, the compression spring pushes the shaft rod 45 in the direction away from the electromagnetic driver 46, so that the valve plug 43 is in sealing cooperation with the valve ring in the initial state.

[0049] In this embodiment, the inner flow pipe 41 is rotatably connected to the heat transfer sleeve 5. A plurality of needle points 51 are distributed on the side wall of the heat transfer sleeve 5. A flow disturbance sleeve 52 is sleeved at one end of the inner flow pipe 41 located inside the heat transfer sleeve 5.

[0050] A guide ring 47 is fixed inside the cooling column 4. An inclined groove is formed on the side wall of the guide ring 47. A connecting shaft 44 is rotatably connected to the shaft rod 45. The inner flow pipe 41 is fixed to the connecting shaft 44. A pin is fixed on the side wall of the connecting shaft 44. The pin is arranged to slide along the inclined groove. Therefore, when the shaft rod 45 slides axially for adjustment, it can synchronously control the heat transfer sleeve 5 to slide. At this time, the shaft rod 45 can be deflected by the sliding action of the pin on the connecting shaft 44 and the inclined groove, so that the turbulence sleeve 52 on the shaft rod 45 turbulates the coolant in the heat transfer sleeve 5, improving the heat exchange efficiency and accelerating the heat transfer speed. Therefore, during the extremely rapid cooling of the cooling column, the electromagnetic driver 46 first drives the shaft rod 45 to slide towards the direction close to the electromagnetic driver 46 in the first stage, so that the valve plug 43 on the shaft rod 45 is separated from the valve ring. At this time, the coolant flows into the cooling column 4. Then, in the second stage, the electromagnetic driver 46 uses a controller (such as a PLC or a dedicated motion controller) to precisely control the current direction and intensity of the electromagnetic driver 46. Among them, by changing the current direction, the electromagnetic driver 46 generates electromagnetic forces in two opposite directions, thereby driving the shaft rod 45 to slide reciprocally. At this time, the coolant can flow and exchange heat efficiently in the heat transfer sleeve 5.

[0051] In this embodiment, a plurality of thin channels 53 are circumferentially distributed on the outer wall of the heat transfer sleeve 5. The cross-section of each thin channel 53 is in a U-shaped structure;

[0052] The outer wall of the heat transfer sleeve 5 is in sliding and sealing contact with the guide groove 14, and heat-conducting oil is pre-filled between the heat transfer sleeve 5 and the guide groove 14; the heat-conducting oil can quickly transfer the heat of the moving template 12 to the heat transfer sleeve 5;

[0053] On the side wall of the heat transfer sleeve 5, direct current holes 54 are formed at the positions of the thin channels 53. A hole cavity 55 is formed in the middle of the lower end surface of the heat transfer sleeve 5. Each direct current hole 54 is communicated with the hole cavity 55;

[0054] A sealing disc 56 is fixed in the guide groove 14. The sealing disc 56 is slidably connected with the hole cavity 55. A partition disc is fixed at the port of the hole cavity 55. A plurality of one-way discharge holes 57 are formed on the partition disc. Therefore, in the second stage when the electromagnetic driver 46 works, it can push the shaft rod 45 to slide reciprocally, and the heat transfer sleeve 5 can synchronously displace with the shaft rod 45. At this time, when the heat transfer sleeve 5 slides towards the side far from the electromagnetic driver 46, the heat transfer sleeve 5 can press the heat-conducting oil into the thin channels 53, and the heat-conducting oil enters the hole cavity 55 through the direct current holes 54. When the heat transfer sleeve 5 slides towards the side close to the electromagnetic driver 46, the heat-conducting oil is squeezed by the sealing disc 56 and discharged into the guide groove 14 through the one-way discharge holes 57.

[0055] As a preferred embodiment, the heat transfer sleeve 5 axially slides reciprocally under the push of the electromagnetic force of the electromagnetic driver 46.

[0056] In this embodiment, a cooling channel 31 is provided in the middle of the cooling plate 3, and one end of the cooling pipe 22 is connected to the cooling channel 31;

[0057] The area of the cooling plate 3 outside the cooling channel 31 is evenly divided into a plurality of flow chambers, and a plurality of runoff plates 32 are arranged and fixed in each flow chamber. The cross-section of the runoff plate 32 is in an arc structure, and a plurality of radial holes 33 are provided on the runoff plate 32;

[0058] Drainage plates 34 are fixed between the runoff plates 32, and the plurality of drainage plates 34 cooperate with each other to make the coolant flow in a serpentine distribution.

[0059] In this embodiment, a plurality of fixing holes 35 are provided on the outer side wall of the outer edge of the cooling plate 3, and an outer pipe group 36 is hermetically connected outside each fixing hole 35. An inlet pipe 37 and an outlet pipe 38 are connected to each outer pipe group 36. Therefore, on the one hand, the inlet pipe 37 can send the coolant into the cooling plate 3 through the outer pipe group 36. At this time, the coolant passes through each flow chamber and finally discharges from the cooling channel 31, so as to realize the overall cooling and temperature reduction method of gradually cooling from the outside to the center, so as to first cool the edge part of the mold and then gradually cool to the center. This method is suitable for automotive parts whose edges are prone to overheating or need to be cooled preferentially at the edges; on the other hand, the coolant can be sent into the cooling plate 3 through the cooling channel 31. At this time, the coolant passes through each flow chamber and finally discharges from the outlet pipe 38 on each outer pipe group 36, so as to realize the overall cooling and temperature reduction method of gradually cooling from the center to the outside, first cooling the central part of the mold and then gradually expanding to the edge. This method is suitable for automotive parts that are thicker or whose central parts are prone to overheating, such as the inner panel of the car door, the engine hood, etc. Since the central part is prone to heat accumulation during the injection molding process, cooling the central part first can effectively prevent local overheating, reduce thermal stress and material deformation, and ensure its dimensional accuracy and surface quality.

[0060] A cooling method for injection molding of automotive plastic parts, which includes the following steps:

[0061] S1. Mold closing and injection molding. The molten plastic enters the injection molding machine frame 1 through the hopper. The moving template 12 approaches the fixed template 11 under the drive of the mold closing propulsion unit 13 and completes the mold closing; high-temperature hot oil is supplied to each cooling column 4 through the liquid inlet pipe 23 to preheat the moving template 12, and then the molten plastic is injected into the mold cavity through the injection molding machine frame 1. After being completely filled, a certain pressure is maintained to make the plastic evenly distributed and preliminarily compacted;

[0062] S2. Rapid cooling. According to the special forming positions of the formed automotive parts, such as the reinforcing ribs and support structures, the cooling columns 4 at the corresponding positions are used to rapidly cool them. Among them, the coolant enters the cooling columns 4 through the liquid inlet pipe 23 correspondingly. The valve plug 43 on the inner flow pipe 41 of the cooling columns 4 at the corresponding positions is controlled by the electromagnetic driver 46 to be separated from the valve ring, and the coolant flows out from the end of the inner flow pipe 41 to achieve circulation. At the same time, the electromagnetic driver 46 controls the inner flow pipe 41 to perform high-frequency reciprocating displacement, and the heat transfer sleeve 5 can slide synchronously with the inner flow pipe 41, so that the heat-conducting oil can fully flow in each fine channel 53 of the heat transfer sleeve 5, and the heat is quickly taken away by the coolant flowing inside the cooling column 4, so that these areas are quickly cooled, preliminarily shaped and the thermal stress is reduced. Among them, the working frequency of the inner flow pipe 41 is 20Hz - 50Hz, so that the flow rate of the heat-conducting oil can be adjusted in different frequency adjustments;

[0063] S3. Overall cooling. The cooling columns 4 stop the cooling operation. According to the requirements of the parts cooling and forming, a step-by-step cooling method from the center to the outside or from the outside to the center is adopted. The coolant enters the cooling plate 3 and fully diffuses and flows in the flow cavity to ensure uniform cooling and prevent overcooling from causing stress concentration. After reaching the predetermined cooling time, the cooling system is shut down. Therefore, the cooling process is divided into two stages and specifically adjusted according to the forming and cooling requirements of the parts, effectively improving the cooling and forming efficiency, reducing the cooling blind area, and further enhancing the cooling effect;

[0064] S4. The mold clamping and propulsion unit 13 moves in the reverse direction, so that the moving mold plate 12 is separated from the fixed mold plate 11, and the formed plastic parts are taken out.

[0065] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A cooling device for injection molding of automobile plastic parts, comprising an injection molding machine frame (1), a fixed mold plate (11), a movable mold plate (12), a cooling unit (2) and a mold clamping advancing unit (13), characterized in that: The fixed platen (11) is vertically fixed to one side of the upper end surface of the injection molding machine frame (1); the movable platen (12) is arranged parallel to the fixed platen (11) and is slidably mounted with the injection molding machine frame (1); a mold clamping propulsion unit (13) is horizontally fixed to the other side of the upper end surface of the injection molding machine frame (1); and an output end of the mold clamping propulsion unit (13) is connected to the movable platen (12); The cooling unit (2) is fixed to an end surface of the movable die plate (12) which is away from the fixed die plate (11); The cooling unit (2) comprises a cooling plate (3) which is assembled in parallel on a movable mold plate (12); a plurality of cooling columns (4) are evenly distributed on one side of the cooling plate (3); guide grooves (14) corresponding to the cooling columns (4) are provided in the movable mold plate (12); a guide plate (21) is fixed on the other side of the cooling plate (3); a cooling pipe (22) is horizontally fixed in the middle of the guide plate (21); one end of the cooling pipe (22) is slidably connected to the mold clamping push unit (13); A liquid inlet pipe (23) and a liquid discharge pipe (24) are fixed inside the guide plate (21); a plurality of first branch pipes are connected to the liquid inlet pipe (23); a plurality of second branch pipes are connected to the liquid discharge pipe (24); the other ends of the first branch pipes and the second branch pipes are connected to each cooling column (4); The outside of the liquid inlet pipe (23) is connected to a coolant delivery pipe and a hot oil pipe via a tee; A heat transfer sleeve (5) is coaxially provided on one end of the cooling column (4), an inner flow tube (41) is provided at the center of the heat transfer sleeve (5), and a guide cavity (42) is provided in the cooling column (4), a through hole is provided on the side wall of the inner flow tube (41) located in the guide cavity (42), and the second branch pipe is connected to the guide cavity (42); A valve plug (43) is fixed on the side wall of the inner flow tube (41), and a valve ring is fixed in the cooling column (4), the valve plug (43) and the valve ring are slidably matched, and a shaft (45) is slidably connected in the cooling column (4); An electromagnetic driver (46) is fixed to the other end of the cooling column (4), and a magnetic piston is fixed to the end of the shaft (45); one side of the magnetic piston is connected to a compression spring; The inner flow tube (41) is rotatably connected to the heat transfer sleeve (5), a plurality of pin points (51) are distributed on the side wall of the heat transfer sleeve (5), and a spoiler sleeve (52) is sleeved on one end of the inner flow tube (41) located inside the heat transfer sleeve (5); A guide ring (47) is fixed inside the cooling column (4), and an inclined groove is provided on the side wall of the guide ring (47). A connecting shaft (44) is rotatably connected to the shaft rod (45). The inner flow tube (41) is fixed to the connecting shaft (44), and a pin is fixed on the side wall of the connecting shaft (44), and the pin is slidably arranged along the inclined groove.

2. The cooling device for injection molding of automobile plastic parts according to claim 1, characterized in that: A plurality of fine channels (53) are distributed circumferentially on the outer wall of the heat transfer sleeve (5), and a cross section of each fine channel (53) is in a U-shaped structure; The outer wall of the heat transfer sleeve (5) is in sliding and sealing contact with the guide groove (14), and heat transfer oil is pre-filled between the heat transfer sleeve (5) and the guide groove (14); A direct current hole (54) is provided on the side wall of the heat transfer sleeve (5) at each narrow channel (53), a cavity (55) is provided in the middle of the lower end surface of the heat transfer sleeve (5), and each direct current hole (54) is connected to the cavity (55); A sealing disk (56) is fixed in the guide groove (14), the sealing disk (56) is slidably connected to the cavity (55), a partition disk is fixed at the end of the cavity (55), and a plurality of one-way holes (57) are formed on the partition disk.

3. The cooling device for injection molding of automobile plastic parts according to claim 2, characterized in that: The heat transfer sleeve (5) slides axially back and forth under the push of the electromagnetic force of the electromagnetic driver (46).

4. The cooling device for injection molding of automobile plastic parts according to claim 1, characterized in that: A cooling channel (31) is provided in the middle of the cooling plate (3), and one end of the cooling pipe (22) is connected to the cooling channel (31); The cooling plate (3) is located outside the cooling channel (31) and is evenly divided into a plurality of flow chambers, a plurality of runoff plates (32) are arranged and fixed in each of the flow chambers, the cross section of the runoff plates (32) is an arc-shaped structure, and a plurality of runoff holes (33) are formed on the runoff plates (32); A flow guide plate (34) is fixed between the runoff plates (32).

5. The cooling device for injection molding of automobile plastic parts according to claim 1, characterized in that: A plurality of fixing holes (35) are provided on the outer side wall of the cooling plate (3), and the fixing holes (35) are all sealedly connected to an outer tube group (36), and each outer tube group (36) is connected to an inlet pipe (37) and an outlet pipe (38).

6. A cooling method for automobile plastic parts during injection molding, which uses the cooling device for automobile plastic parts during injection molding as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Mold closing and injection molding, the molten plastic enters the injection molding frame (1) through the hopper, and the movable mold plate (12) is driven by the mold closing push unit (13) to approach the fixed mold plate (11) and complete the mold closing; high-temperature hot oil is transported to each cooling column (4) through the liquid inlet pipe (23), so as to preheat the movable mold plate (12), and then the molten plastic is injected into the mold cavity through the injection molding frame (1), and a certain pressure is maintained after it is completely filled, so that the plastic is evenly distributed and preliminarily compacted; S2. Rapid cooling. According to the special molding position of the automobile parts after molding, the cooling column (4) at the corresponding position rapidly cools and lowers the temperature thereof, wherein the coolant enters the cooling column (4) through the liquid inlet pipe (23), and the cooling column (4) at the corresponding position controls the valve plug (43) on the inner flow tube (41) to be separated from the valve ring by the electromagnetic driver (46), and the coolant flows out from the end of the inner flow tube (41) to achieve circulation; at the same time, the electromagnetic driver (46) controls and drives the inner flow tube (41) to perform high-frequency reciprocating displacement, and the heat transfer sleeve (5) can slide synchronously with the inner flow tube (41), so that the heat transfer oil fully flows in the fine channels (53) of the heat transfer sleeve (5), and the coolant flowing inside the cooling column (4) quickly takes away the heat, so that these areas are quickly cooled, the initial molding is completed, and the thermal stress is reduced; S3. Overall cooling, the cooling column (4) stops cooling, and according to the requirements of component cooling and molding, a gradual cooling method is adopted from the center to the outside or from the outside to the center. The coolant enters the flow cavity of the cooling plate (3) and fully diffuses and flows to ensure uniform cooling and no excessive cooling to cause stress concentration. After the predetermined cooling time is reached, the cooling system is turned off; S4. The mold pushing unit (13) moves in the reverse direction, so that the movable mold plate (12) is separated from the fixed mold plate (11), and the molded plastic parts are taken out.

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