A rapid injection molding device for plastic

Abstract

The utility model relates to the field of plastic injection molding discloses a kind of plastic rapid injection molding device, including device support, and device support is equipped with injection mold, and device support is equipped with feed pipe, and clamping fixing piece is slidably equipped on bottom plate, injection mold is equipped with injection auxiliary frame and injection mold is equipped with injection feed head, and driving mechanism is equipped on top plate, the beneficial effects compared with prior art of the utility model are as follows: by the precision plug-in of butt joint block and butt joint pipe orifice, trapezoidal block is self-adaptingly attached with the inner wall of pipe orifice under the action of spring three, cooperate with the vertical guidance of slide bar and the elastic buffer of spring two, ensure that feed head and feed inlet always maintain coaxial, avoid material leakage and block mouth from root source;Material block and material leakage hole realize linkage on-off with the lifting of feed head, and feed head goes up after injection pressure maintaining is completed, material block instantaneously cuts off melt flow channel, completely eliminates molten plastic wire drawing and dripping phenomenon, without manual cleaning, guarantee continuous production stability.

Description

Technical Field

[0001] This utility model relates to the field of plastic injection molding, specifically to a rapid plastic injection molding device. Background Technology

[0002] Plastic injection molding is a core process in the manufacturing of electronic, home appliance, and automotive parts. Rapid, high-precision, and continuous stable production are key industry development requirements, and the structural design of injection molding equipment directly determines molding efficiency, product quality, and production continuity. Currently available conventional plastic injection molding equipment has significant shortcomings in its structural design, making it unable to meet the stringent requirements of modern, high-efficiency injection molding production.

[0003] In the injection molding material feeding and cutting-off control process, the existing equipment adopts a structure in which the external injection nozzle is rigidly connected to the mold inlet, and relies only on ordinary sealing rings to achieve sealing. There is no coaxial guiding auxiliary structure, which easily leads to misalignment between the nozzle and the inlet, causing material leakage and nozzle blockage. At the same time, the traditional material feeding structure does not have an automatic cutting-off mechanism. After the injection and holding pressure is completed, it is not possible to cut off the molten material flow channel instantly. Molten plastic is prone to stringing and dripping, which contaminates the mold and the product and requires frequent manual cleaning, which seriously affects the efficiency of continuous production.

[0004] In terms of demolding design, the demolding mechanism of traditional devices is an independent external ejector pin structure, which requires a separate drive source. After the mold is opened, the ejector pin movement is delayed, and the plastic part is very easy to stick to the lower mold cavity, resulting in poor ejection or even deformation and damage to the plastic part. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the above-mentioned difficulties and provide a rapid plastic injection molding device.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0007] A rapid plastic injection molding device includes a device support, an injection mold for producing injection molded plastic parts mounted on the device support, the injection mold including a lower mold and an upper mold mounted on the lower mold, a material conveying pipe located above the injection mold mounted on the device support, the device support including a base plate, a support column mounted on the base plate, a top plate mounted on the support column, a plurality of clamping and fixing components for clamping the injection mold slidably mounted on the base plate, an injection mold auxiliary frame mounted on the injection mold and an injection material conveying head slidably inserted into the injection mold auxiliary frame, the injection mold and the material conveying pipe being connected by the injection material conveying head, and a drive mechanism on the top plate whose bottom is fixedly connected to the injection material conveying head and capable of driving the injection material conveying head to move up and down;

[0008] The upper mold is provided with a feed pipe, and the feed pipe is provided with a connecting pipe port. The feed pipe passes through the top plate. The injection feeding head includes a feeding end block that communicates with the feed pipe. The bottom of the feeding end block is connected to a connecting block that is inserted into the connecting pipe port. The two end faces of the connecting block are provided with corresponding slots. A trapezoidal block with an inclined surface facing downward and abutting against the inner wall of the connecting pipe port is slidably provided in the slot.

[0009] A spring is provided between the trapezoidal block and the inner wall of the slot. The two trapezoidal blocks are provided with a docking groove and a stop block that is inserted into the docking groove. The stop block is provided with a leakage hole at the material conveying channel of the docking block. The bottom of the docking block is provided with a discharge pipe that is inserted into the feed pipe.

[0010] As an improvement, the injection mold is located on a base plate, and the base plate is provided with several grooves around its circumference. The clamping and fixing components include a clamping block that is slidably disposed on the base plate, and a slider that slides in the groove is provided at the bottom of the clamping block.

[0011] As an improvement, a bottom block is provided below the slider, and a screw is rotatably provided on the clamping block, with its bottom threaded into the bottom block. A handle is provided on the screw.

[0012] As an improvement, several support plates are provided on the side end face of the material conveying end block. The injection molding auxiliary frame includes a cross that is sleeved on the outside of the material conveying tube. Several sliding rods that slide through the support plates are provided at the bottom of the cross. A base is provided at the bottom of the sliding rod. A spring is sleeved on the sliding rod between the base and the support plate. A bolt that is threaded into the upper mold is provided at the bottom of the base.

[0013] As an improvement, the drive mechanism includes a rack that slides through the cross and the top plate and is fixed to the support plate at its bottom end. A collar fixed to one end of the rack is fixed to the outside of the conveying pipe and located above the top plate. A drive gear driven by a drive motor located on the top plate is engaged on the other side of the rack.

[0014] As an improvement, the lower mold has a groove and a cooling pipe inside the lower mold. The bottom of the upper mold has a protrusion that mates with the groove. The groove has a slot. The bottom of the upper mold has connecting plates located on both sides of the protrusion. The bottom of the two connecting plates are slidably connected to a U-shaped plate. The bottom of the U-shaped plate has a spring.

[0015] The advantages of this utility model compared with the prior art are as follows:

[0016] 1. This device precisely connects to the connecting pipe by inserting a docking block. The trapezoidal block adaptively fits the inner wall of the pipe under the action of spring three. Combined with the vertical guidance of the sliding rod and the elastic buffer of spring two, it ensures that the feeding head and the feed port always remain coaxial, thus preventing material leakage and clogging at the source. The stop block and the leakage hole are linked to the rise and fall of the feeding head to achieve on / off switching. After the feeding and pressure holding are completed, the feeding head moves upward, and the stop block instantly cuts off the molten material flow channel, completely eliminating the phenomenon of molten plastic stringing and dripping. No manual cleaning is required, ensuring the stability of continuous production.

[0017] 2. When the injection molding auxiliary frame of this device moves upward with the injection molding feeder, it directly drives the upper mold and the lower mold to separate. At the moment of mold opening, the spring in the lower mold extends and resets, pushing the U-shaped plate and the connecting plate to smoothly eject the plastic part from the groove. No additional drive mechanism is required. The ejection action is lag-free and jam-free, effectively avoiding the sticking and deformation of plastic parts, and greatly improving the plastic part molding qualification rate and demolding efficiency.

[0018] 3. This device uses a drive mechanism to rapidly and accurately raise and lower the injection molding feed head, and the cooling pipes are circulated with cooling water to achieve rapid cooling and shaping of the plastic parts. The entire process is integrated and linked, with no waiting gaps between processes. The injection molding cycle is significantly shortened compared to traditional devices. At the same time, the buffer protection and automatic material cutting design of the injection molding auxiliary frame reduce equipment failures and manual intervention, further improving continuous and efficient production capabilities. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a rapid plastic injection molding device according to this utility model. Figure 1 .

[0020] Figure 2 This is a schematic diagram of the overall structure of a rapid plastic injection molding device according to this utility model. Figure 2 .

[0021] Figure 3 This is a schematic diagram showing the overall structure of a rapid plastic injection molding device according to this utility model. Figure 1 .

[0022] Figure 4 This is a schematic diagram showing the overall structure of a rapid plastic injection molding device according to this utility model. Figure 2 .

[0023] Figure 5 This is a partial structural schematic diagram of a rapid plastic injection molding device according to this utility model.

[0024] Figure 6 This is a schematic diagram of the disassembled structure of the injection feeding head of a rapid plastic injection molding device according to this utility model.

[0025] Figure 7 This is a schematic diagram of the disassembled injection mold structure of a rapid plastic injection molding device according to this utility model. Figure 1 .

[0026] Figure 8 This is a schematic diagram of the disassembled injection mold structure of a rapid plastic injection molding device according to this utility model. Figure 2 .

[0027] Figure 9 This is a schematic diagram of the injection molding auxiliary frame structure of a plastic rapid injection molding device according to this utility model.

[0028] Figure 10 This is a schematic diagram of the clamping and fixing component of a plastic rapid injection molding device according to this utility model.

[0029] As shown in the figure: 1. Device support; 101. Base plate; 102. Slide groove; 103. Support column; 104. Top plate; 2. Clamping and fixing components; 201. Clamping block; 202. Slider; 203. Base block; 204. Lead screw; 205. Handle; 3. Injection mold; 301. Lower mold; 302. Groove; 303. Slot; 304. Cooling pipe; 305. Upper mold; 307. Connecting pipe port; 308. Feed pipe; 309. Protrusion; 310. Connecting plate; 311. U-shaped plate; 312. 4. Spring 1; 5. Injection Molding Auxiliary Frame; 6. Slide Rod; 7. Base; 8. Bolt; 9. Spring 2; 10. Cross; 11. Injection Molding Feed Head; 12. Feed End Block; 13. Support Plate; 14. Connecting Block; 15. Slot; 16. Trapezoidal Block; 17. Connecting Groove; 18. Stop Block; 19. Material Discharge Hole; 10. Spring 3; 11. Discharge Pipe; 12. Feed Pipe; 13. Drive Mechanism; 14. Rack; 15. Collar; 16. Drive Gear. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings.

[0031] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 7 As shown:

[0032] A rapid plastic injection molding device includes a device support 1, on which an injection mold 3 capable of producing injection-molded plastic parts is mounted. The injection mold 3 includes a lower mold 301, on which an upper mold 305 is mounted. A material conveying pipe 6 located above the injection mold 3 is mounted on the device support 1. The device support 1 includes a base plate 101, on which a support column 103 is mounted, and on which a top plate 104 is mounted. A plurality of clamping and fixing components 2 capable of clamping the injection mold 3 are slidably mounted on the base plate 101. An injection auxiliary frame 4 is mounted on the injection mold 3, and an injection material conveying head 5 slidably inserted into the injection auxiliary frame 4 is mounted on the injection mold 3. The injection mold 3 and the material conveying pipe 6 are connected by the injection material conveying head 5. A drive mechanism 7 is mounted on the top plate 104, whose bottom is fixedly connected to the injection material conveying head 5 and capable of driving the injection material conveying head 5 to move up and down.

[0033] The working principle of this utility model is as follows: This rapid plastic injection molding device uses the device support 1 as the overall rigid load-bearing foundation. The clamping and fixing parts 2 achieve circumferential adaptive centering clamping of the injection mold 3, preventing mold displacement, mold expansion, and overflow during the injection process. The drive mechanism 7 drives the injection feeding head 5 to descend smoothly in the vertical direction. The injection auxiliary frame 4 provides precise guidance and elastic buffering for the descent process, avoiding damage to the mold interface from hard impacts. At the same time, it ensures coaxial and sealed insertion with the upper mold 305. During the upward movement of the injection auxiliary frame 4, it can drive the upper mold 305 to separate from the lower mold 301. When the upper mold 305 moves upward, it can automatically demold the injection plastic part, thereby completing a more convenient unloading operation. Molten plastic is injected at high speed into the closed cavity of the injection mold 3 through the feeding pipe 6 and the injection feeding head 5. Cooling water is circulated in the lower mold 301 to achieve rapid cooling and shaping of the plastic part.

[0034] When the mold is opened, the material flow can be automatically cut off when the injection feeding head 5 moves upward, which completely solves the problems of material leakage and stringing in traditional injection molding. Ultimately, it can achieve high-speed, stable and high-precision injection molding of plastic parts, greatly shorten the injection cycle, and improve the product qualification rate and production continuity.

[0035] The base plate 101 is horizontally fixed to the injection molding workshop floor by anchor bolts, providing a flat and stable mounting base for the injection mold 3 and the clamping fasteners 2. The radial sliding of the clamping fasteners 2 on its surface ensures that multiple sets of clamping fasteners 2 can move toward the center of the base plate 101. Multiple support columns 103 vertically connect the base plate 101 and the top plate 104 to form a gantry frame with uniform stress, which can withstand the impact and load brought by the injection pressure and mold closing reaction force during the injection process, and prevent the device from deforming or shaking. The through hole reserved in the center of the top plate 104 ensures that the material conveying pipe 6 and the rack 701 can slide freely in the vertical direction.

[0036] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 7 Appendix Figure 10 As shown:

[0037] The injection mold 3 is located on the base plate 101. The base plate 101 has a plurality of sliding grooves 102 around its circumference. The clamping and fixing member 2 includes a clamping block 201 that is slidably disposed on the base plate 101. The bottom of the clamping block 201 is provided with a slider 202 that slides in the sliding groove 102. Below the slider 202 is a bottom block 203. The clamping block 201 is rotatably provided with a lead screw 204 whose bottom is threadedly inserted into the bottom block 203. The lead screw 204 is provided with a handle 205.

[0038] When installing the injection mold 3, first turn the handle 205 to drive the lead screw 204 to rotate. Through the threaded engagement between the lead screw 204 and the bottom block 203, the clamping block 201 is released. Push the clamping block 201 to slide along the slide groove 102 to the outside of the base plate 101 through the slider 202, leaving space for the mold to be placed.

[0039] After the lower mold 301 is placed stably in the center of the base plate 101, push each set of clamping blocks 201 to move along the slide groove 102 towards the mold, so that the clamping surface of the clamping block 201 is in contact with the outer wall of the lower mold 301. Then, turn the handle 205 in the opposite direction to drive the lead screw 204 to rotate in the opposite direction. The lead screw 204 pulls the bottom block 203 upward, so that the bottom block 203 is in contact with and locked to the lower surface of the base plate 101. At the same time, the clamping blocks 201 tighten downward, forming a clamping force on the lower mold 301 from the circumferential direction to achieve a firm clamping of the mold. The whole process does not require additional tools and is easy to operate.

[0040] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 4 Appendix Figure 5 Appendix Figure 6 Appendix Figure 7 Appendix Figure 8 As shown:

[0041] The upper mold 305 is provided with a feed pipe 308, and the feed pipe 308 is provided with a connecting pipe 307. The feed pipe 6 passes through the top plate 104. The lower mold 301 is provided with a groove 302 and a cooling pipe 304 is provided inside the lower mold 301. The bottom of the upper mold 305 is provided with a protrusion 309 that mates with the groove 302. The groove 302 is provided with a slot 303. The bottom of the upper mold 305 is provided with connecting plates 310 located on both sides of the protrusion 309. The bottom of the two connecting plates 310 are slidably inserted with a U-shaped plate 311. The bottom of the U-shaped plate 311 is provided with a spring 312.

[0042] During mold closing, the upper mold 305 descends vertically, and the protrusion 309 at the bottom precisely embeds into the groove 302 of the lower mold 301. The two work together to form a closed plastic part molding cavity. During the mold closing process, the connecting plates 310 on both sides of the upper mold 305 descend synchronously, and simultaneously drive the U-shaped plate 311 to descend. When the spring 312 at the bottom of the U-shaped plate 311 abuts against the slot 303, it is compressed, providing elastic buffering force for the mold closing process and avoiding damage caused by rigid impact between the upper and lower molds 301. After the mold closing is completed, the molten plastic is injected into the closed cavity at high speed through the connecting pipe 307 and the feed pipe 308. After filling the cavity, the pressure is maintained for a period of time to ensure that the plastic part is dense and free of shrinkage marks.

[0043] After the pressure holding is completed, circulating cooling water is introduced into the cooling pipe 304 in the lower mold 301. The cooling water circulates in the cooling pipe 304, quickly removing the heat from the mold and the plastic part, so that the molten plastic in the cavity can be cooled and solidified quickly, greatly shortening the cooling time. After the plastic part is solidified, the upper mold 305 moves upward to open the mold, the spring 312 extends and resets, and the U-shaped plate 311 pushes the plastic part out of the groove 302, completing one injection molding cycle.

[0044] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 4 Appendix Figure 5 Appendix Figure 6 Appendix Figure 7 Appendix Figure 8 Appendix Figure 9 As shown:

[0045] The injection molding feed head 5 includes a feed end block 501 connected to the feed pipe 308. The bottom of the feed end block 501 is connected to a docking plug 503 that is inserted into the docking port 307. The docking plug 503 has corresponding slots 504 on both sides. The slots 504 have trapezoidal blocks 505 that are inclined downwards and abut against the inner wall of the docking port 307. The trapezoidal blocks 505 and the inner wall of the slots 504 are provided with springs 509. The two trapezoidal blocks 505 have corresponding docking grooves 506 and stop blocks 507 that are inserted into the docking grooves 506. The stop blocks 507 are provided with a leakage hole 508 at the feed channel of the docking plug 503. The bottom of the docking plug 503 has a discharge pipe 510 that is inserted into the feed pipe 308.

[0046] Several support plates 502 are provided on the side end face of the material conveying end block 501. The injection molding auxiliary frame 4 includes a cross 405 that is sleeved on the material conveying pipe 6. Several sliding rods 401 that slide through the support plates 502 are provided at the bottom of the cross 405. A base 402 is provided at the bottom of the sliding rods 401. A spring 404 located between the base 402 and the support plate 502 is sleeved on the sliding rods 401. A bolt 403 that is threaded into the upper mold 305 is rotatably provided at the bottom of the base 402.

[0047] After the injection mold 3 is closed, first put the cross 405 on the outside of the material conveying pipe 6, so that the multiple sliding rods 401 are aligned with the threaded holes of the upper mold 305 respectively. Rotate the bolt 403 on the base 402 to lock the bolt 403 in the threaded hole of the upper mold 305, so that the entire injection auxiliary frame 4 is firmly fixed on the top of the upper mold 305 and coaxial with the connecting pipe 307.

[0048] When the drive mechanism 7 drives the injection feeding head 5 downwards, the support plate 502 on the side of the feeding end block 501 slides vertically downwards along the slide rod 401. The slide rod 401 provides precise vertical guidance for the movement of the support plate 502, ensuring that the docking insert 503 of the injection feeding head 5 and the docking pipe 307 always remain coaxial and do not have radial offset. During the downward movement of the support plate 502, the second spring 404 is continuously compressed. The second spring 404 provides elastic buffering force during the downward movement, preventing the injection feeding head 5 from colliding with the docking pipe when it moves downwards rapidly. When the nozzle 307 experiences a rigid impact, the damping effect of the spring causes the mating block 503 to slowly insert into the nozzle 307, ensuring a smooth and impact-free insertion process. When the injection feeding head 5 moves upward to reset, the second spring 404 extends and releases its elastic potential energy, and the auxiliary support plate 502 moves upward to reset along the slide bar 401. Throughout the process, the slide bar 401 remains vertically guided, ensuring that the lifting trajectory of the injection feeding head 5 is always accurate. When the auxiliary support plate 502 abuts against the cross 405, it can drive the upper mold 305 to move upward.

[0049] In the initial state, spring 3 509 is in the extended state, trapezoidal block 505 extends outward from slot 504, and the material leakage hole 508 on stop block 507 is misaligned with the internal material conveying channel of conveying end block 501, realizing the pre-cutting of material flow; when drive mechanism 7 drives injection conveying head 5 downward, docking block 503 is inserted into docking pipe port 307 of upper mold 305, and discharge pipe 510 is simultaneously inserted into feed pipe 308, and the inclined surface of trapezoidal block 505 is in contact with the inner wall of docking pipe port 307. When the contact is made, it is subjected to radial extrusion force from the inner wall of the pipe opening and slides inward along the slot 504, compressing the spring 309; when the two trapezoidal blocks 505 move inward synchronously, they drive the stop block 507 to slide horizontally, so that the leakage hole 508 on the stop block 507 is completely aligned with the internal material conveying channel of the conveying end block 501, and the molten material conveying channel is fully open. The molten plastic is injected into the mold cavity at high speed through the conveying end block 501, leakage hole 508, discharge pipe 510, and feed pipe 308, completing the injection operation;

[0050] After the injection and pressure holding are completed, the drive mechanism 7 drives the injection feeding head 5 to move upward, the docking block 503 is pulled out from the docking pipe port 307, the trapezoidal block 505 loses the squeezing force of the inner wall of the pipe port, and under the elastic force of the spring 3 509, it resets to the outside of the slot 504, driving the stop block 507 to slide in the opposite direction, so that the leakage hole 508 and the feeding channel are misaligned again, instantly cutting off the melt flow channel, realizing automatic material cutting off, and completely avoiding the problems of melt stringing, dripping and overflow.

[0051] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 4 Appendix Figure 5 As shown:

[0052] The drive mechanism 7 includes a rack 701 that slides through the cross 405 and the top plate 104 and is fixedly connected to the support plate 502 at its bottom end. A collar 702 is fixedly connected to one end of the rack 701, which is fixedly sleeved outside the conveying pipe 6 and located above the top plate 104. A drive gear 703 driven by a drive motor located on the top plate 104 is meshed with the other side of the rack 701.

[0053] When injection is required, the servo drive motor on the top plate 104 starts, driving the drive gear 703 to rotate in the forward direction. The drive gear 703 meshes with the rack 701, driving the rack 701 to descend smoothly in the vertical direction. The bottom end of the rack 701 drives the entire injection feeding head 5 to descend synchronously through the support plate 502. At the same time, the collar 702 drives the flexible feeding tube 6 to descend synchronously, ensuring that the feeding tube 6 is always connected to the feeding end block 501. Through the precise control of the servo motor, the downward speed and stroke of the rack 701 can be flexibly adjusted. It first descends quickly to a position close to the docking port 307, and then slowly and precisely inserts, which ensures docking efficiency and avoids impact damage.

[0054] After injection is completed, the servo drive motor rotates in the opposite direction, driving the drive gear 703 to rotate in the opposite direction, driving the rack 701 to move vertically upward, driving the injection feeding head 5 to move upward and reset synchronously, and at the same time driving the feeding tube 6 to move upward through the collar 702. The entire lifting process is smooth and without shaking. During the lifting process, the rack 701 always slides along the guide hole of the top plate 104 and the cross 405, and cooperates with the guide of the slide rod 401 of the injection auxiliary frame 4 to ensure the verticality and stability of the entire lifting action.

[0055] When implementing the rapid plastic injection molding device, the base plate 101 of the device support 1 is first horizontally fixed to the floor of the injection molding workshop with anchor bolts. The handle 205 of the clamping and fixing part 2 is rotated to drive the screw 204 to rotate, so that the clamping block 201 is in a loose state. The clamping block 201 is pushed to slide outward along the slide groove 102 of the base plate 101 through the slider 202, leaving space for mold placement. After the lower mold 301 is placed stably in the center of the base plate 101, each set of clamping blocks 201 is pushed to move along the slide groove 102 towards the mold, so that the clamping surface of the clamping block 201 is in contact with the outer wall of the lower mold 301. The handle 205 is rotated in the opposite direction to drive the screw 204 to rotate in the opposite direction, pulling the bottom block 203 upward to fit and lock with the lower surface of the base plate 101. The clamping block 201 is simultaneously tightened downward, forming a tight grip on the lower mold 301 from the circumferential direction.

[0056] The upper mold 305 is then lowered vertically, so that the protrusion 309 at its bottom is precisely embedded in the groove 302 of the lower mold 301. During the mold closing process, the connecting plates 310 on both sides of the upper mold 305 move down synchronously, causing the U-shaped plate 311 to move down. The spring 312 at the bottom of the U-shaped plate 311 is compressed after it comes into contact with the slot 303 in the groove 302, providing elastic buffer for mold closing. The upper and lower molds 301 cooperate to form a closed plastic part molding cavity.

[0057] Next, the cross 405 of the injection molding auxiliary frame 4 is fitted onto the outside of the material conveying pipe 6, so that the slide rod 401 is aligned with the threaded hole of the upper mold 305. The bolt 403 on the base 402 is rotated to lock it onto the upper mold 305, so that the injection molding auxiliary frame 4 and the connecting pipe 307 of the upper mold 305 remain coaxial. Then, the servo drive motor on the top plate 104 is started, which drives the drive gear 703 to rotate in the forward direction. Through the meshing transmission with the rack 701, the rack 701 is driven to move vertically downward. The bottom end of the rack 701 drives the injection feeding head 5 to move smoothly downward along the slide bar 401 through the support plate 502. During the downward movement of the support plate 502, the second spring 404 is compressed to form an elastic buffer. The docking block 503 of the injection feeding head 5 is accurately inserted into the docking pipe 307. The discharge pipe 510 is simultaneously inserted into the feed pipe 308. The trapezoidal blocks 505 on both sides of the docking block 503 are squeezed by the inner wall of the docking pipe 307, slide inward along the slot 504 and compress the third spring 509, which drives the stop block 507 to slide horizontally, so that the leakage hole 508 on the stop block 507 is completely aligned with the internal feeding channel of the feeding end block 501, thus opening the molten material feeding channel.

[0058] Molten plastic is injected at high speed into the closed cavity of the mold through the feeding pipe 6, injection head 5, and feed pipe 308. After filling the cavity, pressure is maintained for a period of time to ensure that the plastic part is dense and free of shrinkage marks. After the pressure is maintained, circulating cooling water is introduced into the cooling pipe 304 in the mold 301 to quickly remove the heat from the mold and the plastic part, so that the molten plastic in the cavity can be quickly cooled, solidified, and shaped. Then, the servo drive motor is started to rotate in reverse, which drives the drive gear 703 to rotate in reverse, drives the rack 701 to move vertically upward, and drives the injection head 5 to move upward and reset synchronously. The docking block 503 is pulled out from the docking pipe port 307, and the trapezoidal block 505 resets to the outside under the elastic force of the spring 509, which drives the stop block 507 to slide in reverse, so that the leakage hole 508 and the feeding channel are misaligned again, instantly cutting off the molten material flow channel to achieve automatic material cutting.

[0059] The injection feeding head 5 continues to move upward. After the support plate 502 abuts against the cross 405, it drives the upper mold 305 to move upward synchronously to open the mold. The spring 312 extends and resets. The cured plastic part is pushed out of the groove 302 through the U-shaped plate 311 to complete the automatic demolding. After the mold is opened, all mechanisms are reset. After cleaning the mold, the above process can be repeated for the next injection operation.

[0060] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A rapid plastic injection molding device, comprising a device support (1), an injection mold (3) capable of producing injection molded plastic parts mounted on the device support (1), the injection mold (3) comprising a lower mold (301), an upper mold (305) mounted on the lower mold (301), and a material conveying pipe (6) located above the injection mold (3) mounted on the device support (1), characterized in that: The device support (1) includes a base plate (101), a support column (103) is provided on the base plate (101), a top plate (104) is provided on the support column (103), a plurality of clamping and fixing parts (2) that can clamp the injection mold (3) are slidably provided on the base plate (101), an injection auxiliary frame (4) is provided on the injection mold (3), and an injection feeding head (5) that is slidably inserted into the injection auxiliary frame (4) is provided on the injection mold (3). The injection mold (3) and the feeding pipe (6) are connected by the injection feeding head (5). The top plate (104) is provided with a driving mechanism (7) whose bottom is fixed to the injection feeding head (5) and can drive the injection feeding head (5) to move up and down. The upper mold (305) is provided with a feed pipe (308), and the feed pipe (308) is provided with a connecting pipe (307). The conveying pipe (6) passes through the top plate (104). The injection conveying head (5) includes a conveying end block (501) that communicates with the feed pipe (308). The bottom of the conveying end block (501) is connected to a mating plug (503) that is inserted into the connecting pipe (307). The mating plug (503) has corresponding slots (504) on both sides of its end face. A trapezoidal block (505) with an inclined surface facing downward and abutting against the inner wall of the connecting pipe (307) is slidably provided in the slot (504). A spring three (509) is provided between the trapezoidal block (505) and the inner wall of the slot (504). The two trapezoidal blocks (505) are respectively provided with a docking groove (506) and a stop block (507) that is inserted into the docking groove (506). The stop block (507) is provided with a leakage hole (508) at the material conveying channel of the docking plug (503). The bottom of the docking plug (503) is provided with a discharge pipe (510) that is inserted into the feed pipe (308).

2. The rapid plastic injection molding device according to claim 1, characterized in that: The injection mold (3) is located on the base plate (101), and the base plate (101) has a plurality of grooves (102) on its circumference. The clamping and fixing member (2) includes a clamping block (201) that is slidably disposed on the base plate (101), and the bottom of the clamping block (201) is provided with a slider (202) that slides in the groove (102).

3. The rapid injection molding device for plastics according to claim 2, characterized in that: A bottom block (203) is provided below the slider (202), and a screw rod (204) with its bottom threadedly connected to the bottom block (203) is rotatably provided on the clamping block (201). A handle (205) is provided on the screw rod (204).

4. The rapid injection molding device for plastics according to claim 1, characterized in that: The side end face of the material conveying end block (501) is provided with several support plates (502). The injection molding auxiliary frame (4) includes a cross (405) sleeved outside the material conveying pipe (6). The bottom end of the cross (405) is provided with several sliding rods (401) that slide through the support plates (502). The bottom of the sliding rods (401) is provided with a base (402). The sliding rods (401) are covered with a spring (404) located between the base (402) and the support plates (502). The bottom of the base (402) is provided with a bolt (403) that is threadedly inserted into the upper mold (305).

5. A rapid plastic injection molding device according to claim 4, characterized in that: The drive mechanism (7) includes a rack (701) that slides through the cross (405) and the top plate (104) and is fixedly connected to the support plate (502) at its bottom end. A collar (702) is fixedly connected to one end of the rack (701) and is fixedly sleeved outside the conveying pipe (6) and located above the top plate (104). A drive gear (703) driven by a drive motor located on the top plate (104) is meshed on the other side of the rack (701).

6. A rapid plastic injection molding device according to claim 1, characterized in that: The lower mold (301) has a groove (302) and a cooling pipe (304) inside the lower mold (301). The bottom of the upper mold (305) has a protrusion (309) that connects with the groove (302). The groove (302) has a slot (303). The bottom of the upper mold (305) has connecting plates (310) located on both sides of the protrusion (309). The bottom of the two connecting plates (310) is slidably connected to a U-shaped plate (311). The bottom of the U-shaped plate (311) is provided with a spring (312).

Images