Temperature control type injection molding equipment and method for thin-wall plastic parts

Abstract

The invention discloses temperature control type injection molding equipment and method for thin-wall plastic parts, and relates to the technical field of plastic molding device.The temperature control type injection molding equipment comprises an injection molding mechanism, a movable mold mechanism is installed on the top of the injection molding mechanism, and an inflation assembly, an ejection assembly and a plugging assembly are installed on the front side of the movable mold mechanism from inside to outside; the movable mold mechanism comprises a movable mold, and a forming cavity is formed in the rear side of the movable mold. The device is reasonable in structural design, the thin-wall plastic part is flexibly extruded to shake through the airflow impact effect, then the thin-wall plastic part is ejected out through a traditional ejector pin, opening and closing of airflow and a path are automatically completed through a specially-designed plugging assembly, it is guaranteed that the airflow is smooth in the demolding process, and the integrity of a forming cavity in the injection molding process is also guaranteed; the whole process can be automatically completed without redundant driving parts, the problem that thin-wall plastic parts are prone to damage in the ejection and demolding process is solved, and the market competitiveness of products is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic molding equipment, in particular to a temperature-controlled injection molding device and method for thin-walled plastic parts. Background Art

[0002] Temperature-controlled plastic injection molding equipment is an industrial device dedicated to high-precision plastic molding. It ensures a stable injection molding process through a precise temperature control system. Its core technology uses intelligent temperature control technology, combined with efficient heating and cooling modules, to efficiently adjust the temperature of each section inside the injection molding machine and the temperature of the mold. It is suitable for the production of temperature-sensitive products such as engineering plastics and medical consumables.

[0003] In the existing technology, although temperature-controlled injection molding equipment can improve the efficiency and quality of injection molding of plastic products through efficient temperature control, when thin-walled plastic parts such as electronic product panels and product decorative covers are injection molded, the wall thickness of the molded plastic parts is relatively thin, so they are prone to deformation and even cracking when demolded by ejector pins, affecting product quality.

[0004] Therefore, we propose a temperature-controlled injection molding device and method for thin-walled plastic parts to solve the above-mentioned problems. Summary of the Invention

[0005] The object of the present invention is to provide a temperature-controlled injection molding device and method for thin-walled plastic parts to solve the problems raised by the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a temperature-controlled injection molding device for thin-walled plastic parts, comprising an injection molding mechanism, a movable mold mechanism is installed on the top of the injection molding mechanism, and an inflation component, an ejection component and a blocking component are installed on the front side of the movable mold mechanism from the inside to the outside, respectively. The movable mold mechanism includes a movable mold, and the rear side of the movable mold is set as a molding cavity. A first channel, an expansion channel, a connecting channel and a second channel are opened near the outside of the movable mold. A spiral channel and a volute channel are opened near the inside of the movable mold. The first channel and the second channel The front and rear sides are staggered and radially distributed inside the dynamic mold. The expansion channel is overlapped and arranged in the middle position of the first channel and the inner diameter of the expansion channel is larger than the inner diameter of the first channel. The connecting channel is used to connect multiple first channels. The air outlet end of the volute channel and the air inlet end of the spiral channel are connected. The inflation component includes an annular inflation cylinder, which is fixedly installed at the center of the front surface of the dynamic mold. An annular piston is slidably arranged inside the annular inflation cylinder, and a plurality of connecting rods are fixedly connected to the front surface of the annular piston. The front end of the connecting rod slides through the inner wall of the annular inflation cylinder and extends forward.

[0007] Preferably, the outer surface of the annular inflation cylinder is symmetrically opened and fixedly connected to a first air pipe, and an inflation nozzle is installed on the top and bottom of the movable mold. One end of the inflation nozzle is connected to the connecting channel, and the other ends of the two inflation nozzles are fixedly connected to the rear ends of the two first air pipes respectively.

[0008] Preferably, the injection molding mechanism includes a base, a mounting platform is fixedly connected to the top of the base near the front surface, the mounting platform is L-shaped and a cylinder is installed on the top near the rear side, side frames extending backward are fixedly connected to the outer surfaces of both sides of the mounting platform, a static mold is fixedly installed between the outer surfaces of the side frames near the rear side, a temperature-controlled injection molding machine is installed on the top of the base near the rear side, the output end of the temperature-controlled injection molding machine is connected to the feed port of the static mold, a cooling pipe forming a loop is installed on the top of the static mold, the telescopic end of the cylinder slides through the outer surface of the mounting platform and extends backward, and the dynamic mold is fixedly connected to the telescopic end of the cylinder.

[0009] Preferably, the blocking assembly includes a hollow plate and a guide bar, a plurality of blocking needles are fixedly connected to the rear surface of the hollow plate near the edge, the blocking needles are inserted inside the first channel, and a pair of guide columns are fixedly connected to the outer surfaces on both sides of the hollow plate.

[0010] Preferably, the outer surfaces of both sides of the movable mold are fixedly connected with slide rails, the number of the guide bars is set to two, the rear surface of the guide bar is fixedly connected with a slide bar, the slide bar and the slide rail are slidably connected, the outer surface of the guide bar is provided with a pair of parallel waist-circular grooves, the guide column is inserted between the inner walls of the waist-circular grooves near the rear side, the front side of the waist-circular groove is downwardly inclined, and the outer surface of the side frame is provided with a guide groove, the top and bottom of the guide bar are respectively fitted with the top and bottom of the guide groove, and the guide groove is bent as a whole and the rear side is lower than the front side.

[0011] Preferably, the ejection assembly includes a connecting plate and a connecting ring, the connecting plate is arranged on the inner side of the hollow plate, and a plurality of ejector pins are fixedly connected to the rear surface of the connecting plate. The ejector pins are inserted inside the second channel, and the rear ends of the blocking pins and the ejector pins are both in the same plane as the inner wall of the front side of the molding cavity on the front side of the movable mold.

[0012] Preferably, a spring is sleeved on the outside of the ejector pin at a position between the connecting plate and the movable mold, the connecting ring is fixedly connected to the outer surface of the annular inflator near the front surface, a plurality of extension rods are fixedly connected to the front surface of the connecting plate at equal intervals, a limit block is fixedly connected to the outer surface of the extension rod near the front end, the front end of the extension rod slides through the rear surface of the connecting ring and extends forward, and the front surface of the limit block conflicts with the rear surface of the connecting ring.

[0013] Preferably, an air inlet nozzle and an air outlet nozzle are installed on the front surface of the movable mold, one end of the air inlet nozzle is connected to the air inlet end of the volute channel, and the air outlet nozzle is connected to the air outlet end of the spiral channel, and the front end of the connecting rod is fixedly connected to the rear surface of the mounting platform.

[0014] Preferably, a third air pipe is fixedly connected to a position near the rear end of the outer surface of the annular air cylinder, the third air pipe is located on the rear side of the first air pipe, the rear end of the third air pipe is fixedly connected to the air inlet nozzle, a one-way valve and a second air pipe are installed on the outside of one of the first air pipes, the one-way valve is located between the second air pipe and the annular air cylinder, the front end of the second air pipe is connected to the inside of the first air pipe, and the rear end of the second air pipe is fixedly connected to the air outlet nozzle.

[0015] A method for temperature-controlled injection molding of thin-walled plastic parts, comprising the following steps: S1. Molten plastic is added to the interior of a temperature-controlled injection molding machine. The segmented heating plate inside the temperature-controlled injection molding machine regulates the temperature of the internal raw materials. At the same time, it is injected into the interior of the static mold through the internal auger conveying mechanism. As the molten plastic enters the molding chambers inside the static and dynamic molds, coolant is injected into the cooling channel inside the static mold through the cooling pipe to quickly absorb heat, completing cooling and molding, and then demolding is performed; S2: During the demoulding process, the cylinder is used to pull the movable mold mechanism forward, and the blocking component and the inflation component move synchronously during the process; S3. During the forward movement of the blocking assembly, the guide groove inside the side frame guides the guide bar to move upward and drives the hollow plate away from the movable mold. At this time, the blocking needle retracts into the first channel, forming an air flow channel in a connected state among the inflation nozzle, the connecting channel, the expansion channel, and the first channel. S4. During the backward movement of the inflation assembly, the annular inflation cylinder and the annular piston move relative to each other to compress the air. The compressed air enters the molding cavity inside the movable mold through the air flow channel, squeezing the plastic part and loosening it. When the movable mold mechanism moves to the frontmost position, the ejector assembly is squeezed and the thin-walled plastic part is ejected from the mold using the ejector pin.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention has a reasonable structural design. It uses the impact of airflow to flexibly squeeze thin-walled plastic parts to make them shake, and then ejects them through traditional ejectors. The airflow and path are automatically opened and closed by a specially designed blocking component, ensuring smooth airflow during demoulding and the integrity of the molding cavity during injection molding. The entire process can be completed automatically without the need for additional driving parts, solving the problem of thin-walled plastic parts being easily damaged during demoulding, thereby improving the market competitiveness of products. 2. In the present invention, when the movable mold moves forward to push the annular inflation cylinder to generate compressed air, a portion of the air will be discharged from the third air pipe, and then enter the spiral channel inside the movable mold through the air inlet nozzle, and then enter the volute channel from the spiral channel, and finally enter the first air pipe after being discharged from the air outlet nozzle. During this process, the spiral channel and the volute channel are close to the inner wall of the thin-walled plastic part. When the air flow passes through, it can absorb the heat in the movable mold through heat exchange, thereby increasing the cooling speed of the plastic part and ensuring the molding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a temperature-controlled injection molding device for thin-walled plastic parts according to the present invention; Figure 2 A three-dimensional view from another angle of a temperature-controlled injection molding device for thin-walled plastic parts according to the present invention; Figure 3 This is a schematic diagram of the injection molding machine structure of a temperature-controlled injection molding device for thin-walled plastic parts according to the present invention; Figure 4 This is a partial structural cross-sectional view of a temperature-controlled injection molding device for thin-walled plastic parts according to the present invention; Figure 5 This is a schematic structural diagram of a movable mold mechanism of a temperature-controlled injection molding device for thin-walled plastic parts according to the present invention; Figure 6 This is a schematic structural diagram of a blocking component of a temperature-controlled injection molding device for thin-walled plastic parts according to the present invention; Figure 7 This is a cross-sectional view of an inflation component of a temperature-controlled injection molding device for thin-walled plastic parts according to the present invention; Figure 8 The present invention is a schematic diagram of the ejector assembly structure of a temperature-controlled injection molding device for thin-walled plastic parts.

[0018] In the picture: 1. Injection molding mechanism; 101. Base; 102. Mounting platform; 103. Cylinder; 104. Static mold; 105. Cooling pipe; 106. Side frame; 107. Guide groove; 108. Temperature-controlled injection molding machine; 2. Moving mold mechanism; 201. Moving mold; 202. First channel; 203. Expansion channel; 204. Connecting channel; 205. Second channel; 206. Slide rail; 207. Spiral channel; 208. Snail channel; 209. Inlet nozzle; 210. Outlet nozzle; 211. Inflating nozzle; 3. Sealing Blocking assembly; 301, hollow plate; 302, blocking needle; 303, guide column; 304, guide strip; 305, waist groove; 306, slide bar; 4, inflation assembly; 401, annular inflation cylinder; 402, annular piston; 403, connecting rod; 404, first air pipe; 405, one-way valve; 406, second air pipe; 407, third air pipe; 5, ejection assembly; 501, connecting plate; 502, spring; 503, ejector pin; 504, extension rod; 505, limit block; 506, connecting ring. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Reference Figures 1-8 As shown: A temperature-controlled injection molding device for thin-walled plastic parts includes an injection mechanism 1, a movable mold mechanism 2 is installed on the top of the injection mechanism 1, and an inflation component 4, an ejection component 5 and a blocking component 3 are installed on the front side of the movable mold mechanism 2 from the inside to the outside. The movable mold mechanism 2 includes a movable mold 201, and the rear side of the movable mold 201 is set as a molding cavity. The inside of the movable mold 201 is provided with a first channel 202, an expansion channel 203, a connecting channel 204 and a second channel 205 near the outside. The inside of the movable mold 201 is provided with a spiral channel 207 and a volute channel 208 near the inside. The front and rear sides of the first channel 202 and the second channel 205 are staggered and radially distributed. Inside the movable mold 201, the expansion channel 203 is overlapped and arranged in the middle position of the first channel 202, and the inner diameter of the expansion channel 203 is larger than the inner diameter of the first channel 202. The connecting channel 204 is used to connect multiple first channels 202. The air outlet end of the volute channel 208 is connected to the air inlet end of the spiral channel 207. The inflation component 4 includes an annular inflation cylinder 401, which is fixedly installed at the center of the front surface of the movable mold 201. An annular piston 402 is slidably arranged inside the annular inflation cylinder 401, and a plurality of connecting rods 403 are fixedly connected to the front surface of the annular piston 402. The front end of the connecting rod 403 slides through the inner wall of the annular inflation cylinder 401 and extends forward.

[0021] The outer surface of the annular inflation cylinder 401 is symmetrically opened and fixedly connected to the first air pipe 404. The top and bottom of the movable mold 201 are equipped with inflation nozzles 211. One end of the inflation nozzle 211 is connected to the connecting channel 204, and the other ends of the two inflation nozzles 211 are fixedly connected to the rear ends of the two first air pipes 404 respectively.

[0022] The injection molding mechanism 1 includes a base 101, a mounting platform 102 is fixedly connected to the top of the base 101 near the front surface, the mounting platform 102 is L-shaped and a cylinder 103 is installed on the top near the rear side, the outer surfaces of both sides of the mounting platform 102 are fixedly connected to side frames 106 extending backward, a static mold 104 is fixedly installed between the outer surfaces of the side frames 106 near the rear side, a temperature-controlled injection molding machine 108 is installed on the top of the base 101 near the rear side, the output end of the temperature-controlled injection molding machine 108 is connected to the feed port of the static mold 104, a cooling pipe 105 forming a loop is installed on the top of the static mold 104, the telescopic end of the cylinder 103 slides through the outer surface of the mounting platform 102 and extends backward, and the movable mold 201 is fixedly connected to the telescopic end of the cylinder 103.

[0023] The sealing assembly 3 includes a hollow plate 301 and a guide bar 304. A plurality of sealing needles 302 are fixedly connected to the rear surface of the hollow plate 301 near the edge. The sealing needles 302 are inserted inside the first channel 202. A pair of guide columns 303 are fixedly connected to the outer surfaces of both sides of the hollow plate 301.

[0024] The outer surfaces of both sides of the movable mold 201 are fixedly connected with the slide rails 206, the number of guide bars 304 is set to two, the rear surface of the guide bar 304 is fixedly connected with the slide bar 306, the slide bar 306 and the slide rail 206 are slidably connected, and a pair of parallel waist grooves 305 are provided on the outer surface of the guide bar 304. The guide column 303 is inserted between the inner walls of the waist groove 305 near the rear side. The front side of the waist groove 305 is tilted downward, and a guide groove 107 is provided on the outer surface of the side frame 106. The top and bottom of the guide bar 304 are respectively fitted with the inner top and inner bottom of the guide groove 107. The guide groove 107 is bent as a whole and the rear side is lower than the front side.

[0025] The ejection assembly 5 includes a connecting plate 501 and a connecting ring 506. The connecting plate 501 is arranged on the inner side of the hollow plate 301. A plurality of ejector pins 503 are fixedly connected to the rear surface of the connecting plate 501. The ejector pins 503 are inserted into the second channel 205. The rear ends of the blocking pins 302 and the ejector pins 503 are both in the same plane as the inner wall of the front side of the molding cavity of the front side of the movable mold 201.

[0026] A spring 502 is sleeved on the outside of the ejector pin 503, located between the connecting plate 501 and the movable mold 201. The connecting ring 506 is fixedly connected to the outer surface of the annular inflatable cylinder 401 near the front surface. A plurality of extension rods 504 are fixedly connected to the front surface of the connecting plate 501 at equal intervals. A limit block 505 is fixedly connected to the outer surface of the extension rod 504 near the front end. The front end of the extension rod 504 slides through the rear surface of the connecting ring 506 and extends forward. The front surface of the limit block 505 conflicts with the rear surface of the connecting ring 506.

[0027] The present invention uses the following steps: adding molten plastic to the interior of the temperature-controlled injection molding machine 108; the segmented heating plate inside the temperature-controlled injection molding machine 108 regulates the temperature of the internal raw materials; and at the same time, injecting the raw materials into the static mold 104 through the internal auger conveying mechanism; after the molten plastic enters the molding chamber inside the static mold 104 and the movable mold 201, the coolant is injected into the cooling channel inside the static mold 104 through the cooling pipe 105 to quickly absorb heat, so that the molten plastic is cooled and formed into a thin-walled plastic part; then, demoulding and material removal are performed; the cylinder 103 is started to pull the movable mold 201 forward and separate from the static mold 104; at this time, the molded thin-walled plastic part is inside the movable mold 201 and moves with it; during the movement of the movable mold 201, the two sides of the movable mold 201 are The slide rail 206 is connected to the slide bar 306 by sliding, so that the guide bar 304 can only move up and down. In the process of the guide bar 304 located on the inner side of the guide groove 107 following the moving mold 201 moving forward, as the internal space of the guide groove 107 tends to rise, the guide bar 304 will rise in the process of moving forward. When the guide bar 304 rises, under the extrusion of the inclined surface of the waist groove 305, the guide column 303 will move from the rear side of the waist groove 305 to the front side and drive the hollow plate 301 to move forward a distance in front of the moving mold 201. At this time, the blocking needle 302 inserted in the first channel 202 will follow the hollow plate 301 to move backward and enter the expansion channel 203. At this time, the inflation nozzle 211, the connecting channel 204, and the expansion channel 203 and the first channel 202 are in a connected state, and the exhaust port faces the molding cavity on the front side of the movable mold 201. During the backward movement of the movable mold 201, the annular inflatable cylinder 401 will also be driven to move backward, and the annular piston 402 is fixed by the connecting rod 403 and the mounting platform 102. Therefore, during the backward movement of the annular inflatable cylinder 401, the annular piston 402 will move relatively and compress the internal space of the annular inflatable cylinder 401 to form air. At this time, the compressed air passes through the two first air pipes 404, the inflation nozzle 211, the connecting channel 204, the expansion channel 203 and the first channel 202 in sequence and is discharged from the rear side of the first channel 202, thereby playing the role of flexibly extruding the thin-walled plastic product inside the molding cavity through the airflow, causing it to loosen. When the movable mold 201 When it moves to the rearmost position, the surface of the mounting platform 102 squeezes the extension rod 504, and the extension rod 504 pushes the connecting plate 501 to move backward and squeezes the spring 502 to contract. At this time, the ejector pin 503 will extend into the molding cavity of the movable mold 201, thereby ejecting the loose thin-walled plastic part from the mold. This design structure is reasonable, and the air flow impact is used to flexibly squeeze the thin-walled plastic part to make it shake, and then it is ejected by the traditional ejector pin 503. The whole process does not require any additional driving parts and can be completed automatically, which solves the problem that thin-walled plastic parts are easily damaged during the ejection and demoulding process, thereby improving the market competitiveness of the product. Among them, the bottom platform 101 is mainly used to support the device, and the side frame 106 is used to connect the mounting platform 102 and the static mold 104, and a guide groove 107 is provided on the surface.The connecting ring 506 is mainly used to limit the extension rod 504 so that it can only move forward and backward. The limit block 505 is used to limit the movement of the extension rod 504 to prevent excessive backward movement and ensure that the rear end of the ejector pin 503 and the interior of the molding cavity of the movable mold 201 form a flat surface in the initial state.

[0028] Example 2: Figure 4 and Figure 7 As shown, the difference between the embodiment and the embodiment is that an air inlet nozzle 209 and an air outlet nozzle 210 are installed on the front surface of the movable mold 201, one end of the air inlet nozzle 209 is connected to the air inlet end of the volute channel 208, and the air outlet nozzle 210 is connected to the air outlet end of the spiral channel 207, and the front end of the connecting rod 403 is fixedly connected to the rear surface of the mounting platform 102.

[0029] A third air pipe 407 is fixedly connected to the outer surface of the annular air cylinder 401 near the rear end. The third air pipe 407 is located on the rear side of the first air pipe 404. The rear end of the third air pipe 407 is fixedly connected to the air inlet nozzle 209. A one-way valve 405 and a second air pipe 406 are installed on the outside of one of the first air pipes 404. The one-way valve 405 is located between the second air pipe 406 and the annular air cylinder 401. The front end of the second air pipe 406 is connected to the inside of the first air pipe 404, and the rear end of the second air pipe 406 is fixedly connected to the air outlet nozzle 210.

[0030] The present invention uses the following steps: when the movable mold 201 moves forward to push the annular inflation cylinder 401 to generate compressed air, a portion of the air will be discharged from the third air pipe 407, and then enter the spiral channel 207 inside the movable mold 201 through the air inlet nozzle 209, and then enter the volute channel 208 from the spiral channel 207, and finally enter the first air pipe 404 after being discharged from the air outlet nozzle 210. During the process, the spiral channel 207 and the volute channel 208 are close to the inner wall of the thin-walled plastic part. When the air flow passes through, the heat in the movable mold 201 can be absorbed through heat exchange, thereby increasing the cooling speed of the plastic part and ensuring the quality of the finished product. The air in the annular inflator 401 is pressurized and compressed air is supplied to the upper mold cavity 404, thereby achieving a desired molding effect. In the process, after the annular piston 402 passes through the first air pipe 404, the remaining compressed air will be completely discharged from the third air pipe 407, and the air that has absorbed the heat will be discharged into the upper first air pipe 404 through the second air pipe 406, and finally discharged from the molding cavity of the movable mold 201, thereby avoiding the continuous supply of air after the plastic part is loosened by the impact of the air flow. This design further improves the air usage effect inside the annular inflator 401, and the one-way valve 405 is used to control the air flow direction inside the upper first air pipe 404, ensuring the flow direction of the air discharged from the second air pipe 406 after entering the first air pipe 404.

[0031] The effect and working principle of the entire mechanism are as follows: when in use, molten plastic is added to the interior of the temperature-controlled injection molding machine 108, and the segmented heating plate inside the temperature-controlled injection molding machine 108 adjusts the temperature of the internal raw materials. At the same time, it is injected into the interior of the static mold 104 through the internal auger conveying mechanism. As the molten plastic enters the molding chambers inside the static mold 104 and the movable mold 201, coolant is injected into the cooling channel inside the static mold 104 through the cooling pipe 105 to quickly absorb heat, so that the molten plastic is cooled and formed into a thin-walled plastic part. Then, the demoulding is carried out to remove the material. When in use, the cylinder 103 is started to pull the movable mold 201 forward and separate it from the static mold 104. At this time, the thin-walled plastic part after molding is inside the movable mold 201 and moves along with it. During the movement of the movable mold 201, the slide rails 206 on both sides thereof are connected with the slide bar 306 by sliding, so that the guide bar 304 can only move up and down. In the process of the guide bar 304 located inside the guide groove 107 following the movement of the movable mold 201 forward, as the internal space of the guide groove 107 tends to rise, the guide bar 304 will rise in the process of moving forward, and the guide bar When 304 rises, under the extrusion of the inclined surface of the waist groove 305, the guide column 303 will move from the rear side of the waist groove 305 to the front side and drive the hollow plate 301 to move forward a distance in front of the movable mold 201. At this time, the blocking needle 302 inserted in the first channel 202 will follow the hollow plate 301 and move backward and enter the expansion channel 203. At this time, the inflation nozzle 211, the connecting channel 204, the expansion channel 203 and the first channel 202 are in a connected state, and the exhaust port is facing the molding cavity on the front side of the movable mold 201. During the backward movement of the movable mold 201, the annular inflation cylinder 4 will also be driven. 01 moves backward, and the annular piston 402 is fixed by the connecting rod 403 and the mounting platform 102. Therefore, during the backward movement of the annular inflator 401, the annular piston 402 will move relatively and compress the internal space of the annular inflator 401 to form air. At this time, the compressed air passes through the two first air pipes 404, the inflation nozzle 211, the connecting channel 204, the expansion channel 203 and the first channel 202 in sequence and is discharged from the rear side of the first channel 202, thereby playing the role of flexibly extruding the thin-walled plastic product inside the molding cavity through the air flow, causing it to loosen. When the movable mold 201 moves to the rear side When the connecting plate 501 is in the right position, the surface of the mounting platform 102 squeezes the extension rod 504, and the extension rod 504 pushes the connecting plate 501 backward and squeezes the spring 502 to contract. At this time, the ejector pin 503 will extend from the inside of the second channel 205 into the molding cavity of the movable mold 201, thereby ejecting the loose thin-walled plastic part from the mold. This design structure is reasonable, and the air flow impact is used to flexibly squeeze the thin-walled plastic part to make it shake, and then it is ejected by the traditional ejector pin 503. The whole process does not require additional driving parts and can be completed automatically, which solves the problem of thin-walled plastic parts being easily damaged during the ejection and demolding process, thereby improving the market competitiveness of products. When the movable mold 201 moves forward and pushes the annular inflation cylinder 401 to generate compressed air, a part of the air will also be discharged from the third air pipe 407, and then enter the spiral channel 207 inside the movable mold 201 through the air inlet nozzle 209, and then enter the volute channel 208 from the spiral channel 207, and finally enter the first air pipe 404 after being discharged from the air outlet nozzle 210. During the process, the spiral channel 207 and the volute channel 208 are close to the inner wall of the thin-walled plastic part. When the air flow passes through, the heat in the movable mold 201 can be absorbed through heat exchange, thereby increasing the cooling speed of the plastic part and ensuring the molding effect. In the process, after the annular piston 402 passes through the first air pipe 404, the remaining compressed air will be completely discharged from the third air pipe 407, avoiding the continuous supply of air after the plastic part is loosened by the impact of the air flow. This design further improves the air usage effect inside the annular inflation cylinder 401.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A temperature-controlled injection molding device for thin-walled plastic parts, comprising an injection molding mechanism (1), characterized in that: A movable mold mechanism (2) is installed on the top of the injection molding mechanism (1), and an inflation component (4), an ejection component (5), and a blocking component (3) are installed on the front side of the movable mold mechanism (2) from the inside to the outside. The movable mold mechanism (2) comprises a movable mold (201), the rear side of the movable mold (201) is set as a molding cavity, the inside of the movable mold (201) is provided with a first channel (202), an expansion channel (203), a connecting channel (204) and a second channel (205) at a position close to the outside, the inside of the movable mold (201) is provided with a spiral channel (207) and a volute channel (208) at a position close to the inside, the front and rear sides of the first channel (202) and the second channel (205) are staggered and radially distributed inside the movable mold (201), the expansion channel (203) is arranged to overlap at a middle position of the first channel (202), and the inner diameter of the expansion channel (203) is larger than the inner diameter of the first channel (202), the connecting channel (204) is used to connect the multiple first channels (202), and the air outlet end of the volute channel (208) is connected to the air inlet end of the spiral channel (207); The inflation assembly (4) comprises an annular inflation cylinder (401), the annular inflation cylinder (401) being fixedly mounted at the center of the front surface of the movable mold (201), an annular piston (402) being slidably arranged inside the annular inflation cylinder (401), a plurality of connecting rods (403) being fixedly connected to the front surface of the annular piston (402), the front ends of the connecting rods (403) slidingly penetrating the inner wall of the annular inflation cylinder (401) and extending forward.

2. The temperature-controlled injection molding equipment for thin-walled plastic parts according to claim 1, characterized in that: The outer surface of the annular inflation cylinder (401) is fixedly connected to a first air pipe (404) near a symmetrical opening, and an inflation nozzle (211) is installed on the top and bottom of the movable mold (201). One end of the inflation nozzle (211) is connected to the communication channel (204), and the other ends of the two inflation nozzles (211) are fixedly connected to the rear ends of the two first air pipes (404) respectively.

3. The temperature-controlled injection molding equipment for thin-walled plastic parts according to claim 1, characterized in that: The injection molding mechanism (1) comprises a base (101), a mounting platform (102) is fixedly connected to the top of the base (101) near the front surface, the mounting platform (102) is L-shaped and a cylinder (103) is installed at the top near the rear side, the outer surfaces of both sides of the mounting platform (102) are fixedly connected to side frames (106) extending backward, a static mold (104) is fixedly installed between the outer surfaces of the side frames (106) near the rear side, a temperature-controlled injection molding machine (108) is installed at the top of the base (101) near the rear side, the output end of the temperature-controlled injection molding machine (108) is connected to the feed port of the static mold (104), a cooling pipe (105) forming a loop is installed on the top of the static mold (104), the telescopic end of the cylinder (103) slides through the outer surface of the mounting platform (102) and extends backward, and the movable mold (201) is fixedly connected to the telescopic end of the cylinder (103).

4. The temperature-controlled injection molding equipment for thin-walled plastic parts according to claim 3, characterized in that: The blocking assembly (3) comprises a hollow plate (301) and a guide bar (304); a plurality of blocking needles (302) are fixedly connected to the rear surface of the hollow plate (301) near the edge; the blocking needles (302) are inserted into the first channel (202); and a pair of guide posts (303) are fixedly connected to the outer surfaces of both sides of the hollow plate (301).

5. The temperature-controlled injection molding equipment for thin-walled plastic parts according to claim 4, characterized in that: The outer surfaces of both sides of the movable mold (201) are fixedly connected with slide rails (206), the number of the guide bars (304) is set to two, the rear surface of the guide bar (304) is fixedly connected with a slide bar (306), the slide bar (306) and the slide rail (206) are slidably connected, the outer surface of the guide bar (304) is provided with a pair of parallel waist-round grooves (305), the guide column (303) is inserted between the inner walls of the waist-round grooves (305) near the rear side, the front side of the waist-round groove (305) is inclined downward, the outer surface of the side frame (106) is provided with a guide groove (107), the top and bottom of the guide bar (304) are respectively fitted with the inner top and inner bottom of the guide groove (107), and the guide groove (107) is bent as a whole and the rear side is lower than the front side.

6. The temperature-controlled injection molding equipment for thin-walled plastic parts according to claim 4, characterized in that: The ejection assembly (5) comprises a connecting plate (501) and a connecting ring (506), wherein the connecting plate (501) is arranged inside the hollow plate (301), and a plurality of ejector pins (503) are fixedly connected to the rear surface of the connecting plate (501), wherein the ejector pins (503) are inserted into the interior of the second channel (205), and the rear ends of the blocking pins (302) and the ejector pins (503) are both in the same plane as the inner wall of the front side molding cavity of the movable mold (201).

7. The temperature-controlled injection molding equipment for thin-walled plastic parts according to claim 6, characterized in that: The ejector pin (503) is externally provided with a spring (502) at a position between the connecting plate (501) and the movable mold (201); the connecting ring (506) is fixedly connected to a position of the outer surface of the annular inflatable cylinder (401) near the front surface; a plurality of extension rods (504) are fixedly connected to the front surface of the connecting plate (501) at equal intervals; a position of the outer surface of the extension rod (504) near the front end is fixedly connected to a limiting block (505); the front end of the extension rod (504) slides through the rear surface of the connecting ring (506) and extends forward; the front surface of the limiting block (505) and the rear surface of the connecting ring (506) are in conflict.

8. The temperature-controlled injection molding equipment for thin-walled plastic parts according to claim 1, characterized in that: An air inlet nozzle (209) and an air outlet nozzle (210) are installed on the front surface of the movable mold (201), one end of the air inlet nozzle (209) is connected to the air inlet end of the volute channel (208), and the air outlet nozzle (210) is connected to the air outlet end of the spiral channel (207), and the front end of the connecting rod (403) is fixedly connected to the rear surface of the mounting platform (102).

9. The temperature-controlled injection molding equipment for thin-walled plastic parts according to claim 1, characterized in that: A third air pipe (407) is fixedly connected to a position near the rear end of the outer surface of the annular air cylinder (401), and the third air pipe (407) is located on the rear side of the first air pipe (404). The rear end of the third air pipe (407) is fixedly connected to the air inlet nozzle (209). A one-way valve (405) and a second air pipe (406) are installed on the outside of one of the first air pipes (404). The one-way valve (405) is located between the second air pipe (406) and the annular air cylinder (401). The front end of the second air pipe (406) is connected to the inside of the first air pipe (404), and the rear end of the second air pipe (406) is fixedly connected to the air outlet nozzle (210).

10. A method for temperature-controlled injection molding of thin-walled plastic parts, characterized in that: The temperature-controlled injection molding device for thin-walled plastic parts according to claim 9 comprises the following steps: S1, adding molten plastic into the temperature-controlled injection molding machine (108), the segmented heating plate inside the temperature-controlled injection molding machine (108) adjusts the temperature of the internal raw material, and at the same time injects it into the static mold (104) through the internal auger conveying mechanism, and after the molten plastic enters the molding chamber inside the static mold (104) and the dynamic mold (201), the cooling liquid is injected into the internal cooling channel of the static mold (104) through the cooling pipe (105) to quickly absorb heat, completing cooling molding, and then demoulding; S2, during the demoulding process, the cylinder (103) is used to pull the movable mold mechanism (2) forward, and during the process, the blocking component (3) and the inflation component (4) move synchronously; S3, during the forward movement of the blocking assembly (3), the guide groove (107) inside the side frame (106) guides the guide bar (304) to move upward and drives the hollow plate (301) away from the movable mold (201), at which time the blocking needle (302) contracts toward the inside of the first channel (202) and forms an air flow channel in a connected state with the inflation nozzle (211), the connecting channel (204), the expansion channel (203) and the first channel (202); S4. During the backward movement of the inflation component (4), the annular inflation cylinder (401) and the annular piston (402) move relative to each other to compress the air. The compressed air enters the internal molding cavity of the movable mold (201) through the air flow channel and squeezes the plastic part to loosen it. When the movable mold mechanism (2) moves to the frontmost position, the ejection component (5) is squeezed and the ejector pin (503) is used to eject the thin-walled plastic part from the mold.

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