Anti-backflow injection molding machine and working method thereof

Abstract

The invention discloses an anti-backflow injection molding machine and a working method thereof, and particularly relates to the technical field of injection molding equipment. The mold molding units in the invention are used alternately. After the fixed mold plate 2 is injected by the corresponding material storage box, the movable mold plate 1 moves toward the fixed mold plate 1, so that the mold base 2 on the fixed mold plate 1 cooperates with the mold base 1 on the movable mold plate, and then the material is continuously injected from another material storage box to ensure the continuity of the injection molding. During the injection molding, the injection molding channel is in a normal flow state. After the material is filled into the corresponding mold molding unit, the passage of the injection molding channel is first blocked by the sealing plug plate 2, and then the piston is pushed forward by the cylinder for a predetermined distance, so that the remaining material in the injection molding channel is pushed toward the position of the sealing plug plate 1, the material is compressed, and the material entering the mold molding unit is filled tightly. Then the sealing plug plate 1 is inserted downward into the injection molding channel to provide double protection to prevent the injection molding liquid from flowing back on both sides.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding equipment, in particular to an anti-backflow injection molding machine and a working method thereof. Background Art

[0002] Injection molding machine is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting materials. Injection molding is achieved through injection molding machines and molds. With the help of the thrust of the screw (or plunger), the plasticized molten state (i.e. viscous flow state) plastic is injected into the closed mold cavity, and the product is obtained after solidification and shaping.

[0003] After searching, the invention patent with publication number CN118124086B discloses an injection molding machine spraying device, which improves the efficiency and quality of cleaning residual injection molding materials at the spray nozzle.

[0004] In the prior art, when the material in the injection molding machine enters the injection mold through the injection barrel, there is a phenomenon that the injection liquid flows back into the injection barrel when the injection mold is injected, which causes the plastic material in the injection mold to be uneven and defective, affecting the dimensional accuracy and appearance quality of the product; in addition, after the product is injected, the impurities inside the mold need to be removed and cleaned, which requires the injection molding machine to be shut down for a period of time, resulting in increased production time. Summary of the invention

[0005] The object of the present invention is to provide an anti-backflow injection molding machine and a working method thereof to solve the problems mentioned in the above background technology.

[0006] The technical problems mainly solved by the present invention are:

[0007] During the injection molding process, the injection mold in the existing solution has the phenomenon that the injection liquid flows back into the injection barrel, which causes the plastic material in the injection mold to be uneven and defective, thus affecting the dimensional accuracy and appearance quality of the product.

[0008] After the product is injected, it is necessary to remove and clean the impurities inside the mold, which requires the injection molding machine to be shut down for a period of time, resulting in increased production time.

[0009] The present invention can be achieved through the following technical solutions:

[0010] An anti-backflow injection molding machine comprises a material storage box installed on the top surfaces of both sides of a base, a mold forming unit for alternate use is installed between the two material storage boxes, the mold forming unit comprises a fixed mold plate 1 and a fixed mold plate 2 fixedly connected to the top surface of a base plate, a movable mold plate is slidably arranged between the fixed mold plate 1 and the fixed mold plate 2, a mold base 1 on both sides of the movable mold plate is respectively used in conjunction with the fixed mold plate 1 and the mold base 2 installed on the fixed mold plate 2, an injection channel is installed on the inner side of the material storage box, one end of the injection channel is connected to the fixed mold plate 1, and the other end of the injection channel is connected to the fixed mold plate 2, a drive seat is fixedly arranged on the edge of the injection channel close to the fixed mold plate 1 or the fixed mold plate 2, and an anti-backflow sealing component is arranged inside the drive seat;

[0011] The anti-backflow sealing assembly includes a sealing plug plate 2 and a sealing plug plate 1 which are slidably plugged with the injection channel, wherein the sealing plug plate 2 and the sealing plug plate 1 do not move in contact with the bottom of the inner cavity of the injection channel at the same time, and a piston which automatically resets and pushes the material in the injection channel is sealedly connected to the side of the sealing plug plate 2, and a reset cylinder for pushing the piston to move linearly is embedded in the sealing plug plate 2;

[0012] A connecting plate and a top plate are installed on the top of the fixed mold plate 1 and the fixed mold plate 2 in sequence, a linear guide rail 2 is arranged on the bottom surface of the top plate, an electric push rod is installed on the sliding seat outside the linear guide rail 2, a rotating unit for adjusting the cleaning direction is arranged on the pushing end of the electric push rod, the rotating unit includes a rotating cylinder, and a cleaning component for cleaning the alternately used mold forming units is installed on the driving end of the rotating cylinder.

[0013] A further technical improvement of the present invention is that two mutually meshing connecting gears 2 are rotatably installed inside the driving seat, a rotating rod is fixedly sleeved on the outside of the shaft of each connecting gear 2, the initial positions of the two rotating rods are different, the rotating rod includes a straight section and a guide section, the tops of the sealing plug plate 1 and the sealing plug plate 2 are fixed with a sliding limit shaft in the straight section and the guide section, and a spring is installed between the piston and the sealing plug plate 2.

[0014] A further technical improvement of the present invention is that a limiting straight groove is provided on the straight section, a limiting arc groove connected to the end of the limiting straight groove is provided on the guide section, and the limiting shaft slides in the limiting straight groove and the limiting arc groove.

[0015] A further technical improvement of the present invention is that a mounting plate is fixedly provided on the outside of the pushing end of the electric push rod, and arc-shaped grooves with different arc lengths and directions are provided on the outside of the mounting plate. A support rod is slidably installed inside the arc-shaped groove, and the end of the support rod is fixed to the cleaning component.

[0016] A further technical improvement of the present invention is that a cleaning box for storing dry ice particles is installed on the top of the top plate, and the cleaning assembly includes a clamping drive member, one driving end of the clamping drive member is connected to a docking portion 1 adapted to a mold base 2 on a fixed mold plate 1, and the other driving end of the clamping drive member is connected to a docking portion 2 adapted to a mold base 1 on a movable mold plate, and a material conveying pipe connected to the cleaning box is installed between the docking portion 1 and the docking portion 2.

[0017] A further technical improvement of the present invention lies in that: a distribution pipe is embedded and installed on one side surface of the docking part, a telescopic pipe is installed between the distribution pipe and the feed pipe, a plurality of straight-through pipes are rotatably installed on the side of the docking part away from the distribution pipe, each of the straight-through pipes is rotatably arranged with the distribution pipe, and a connecting gear 1 for meshing transmission is sleeved on the outer surface of each straight-through pipe, side-through pipes are rotatably installed on the four side surfaces of the inner cavity of the docking part facing the fixed template 1 or the fixed template 2, at least one straight-through pipe and the outer surface of the corresponding side-through pipe are fixedly sleeved with mutually meshing bevel gears, nozzles are fixed on the ends of the side-through pipe and the straight-through pipe, and the side-through pipe and the corresponding straight-through pipe are rotatably matched.

[0018] A further technical improvement of the present invention is that a sliding rod is fixedly installed at the edge position between the fixed mold plate 1 and the fixed mold plate 2, a linear guide rail 1 is installed on the bottom surface of the connecting plate, the sliding seat outside the linear guide rail 1 is fixedly connected to the movable mold plate, the movable mold plate and the sliding rod are slidably arranged, and a notch for the cleaning component to pass through is provided in the middle of the top surface of the movable mold plate.

[0019] A further technical improvement of the present invention is that a hopper for adding materials is arranged on the top surface of each material storage box.

[0020] A further technical improvement of the present invention is: a working method of an anti-backflow injection molding machine, the working method comprising the following steps:

[0021] Step 1: After the injection molding of the movable mold plate and the fixed mold plate 1 is completed, the movable mold plate moves toward the fixed mold plate 2, and the movable mold plate and the fixed mold plate 2 are alternately injected with materials through another material storage box;

[0022] Step 2: After the injection is completed, the second sealing plate blocks the passage of the injection channel, and the piston moves forward a predetermined distance to push the remaining material in the injection channel toward the position of the first sealing plate. Then, the first sealing plate is inserted downward into the injection channel to prevent the injection liquid from flowing back.

[0023] Step 3: After that, the cleaning component slides into the middle of the upper part of the fixed template 1 and the movable template under the sliding of the linear guide rail 2, and the cleaning component is pushed downward by the electric push rod, so that the docking part 1 and the docking part 2 are respectively at the same height as the die base 1 and the die base 2 on the sides of the fixed template 1 and the movable template, and the clamping driving part drives the docking part 1 to match the die base 2, and the docking part 2 to match the die base 1;

[0024] Step 4: During cleaning, the dry ice particles in the cleaning box are accelerated by high-pressure air to pass through the inside of the feed pipe, telescopic pipe and distribution pipe in turn, and the dry ice particles are sprayed out through the nozzles on the straight pipe and the side pipe rotating in different directions to clean the inner cavity of the mold base two in multiple directions. The dry ice particles collide with the surface of the mold base two, quickly sublimate into gas, and produce a strong physical impact, which quickly freezes and brittles the residue on the surface of the mold base two and peels it off; similarly, the mold base one is cleaned in the same way.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The fixed template 1 and the movable template, as well as the movable template and the fixed template 2 in the present invention are used alternately. After the fixed template 2 is injected by the corresponding material storage box, the movable template 1 moves toward the fixed template 1, so that the mold base 2 on the fixed template 1 cooperates with the mold base 1 on the movable template, and then the other material storage box continues to inject material, thereby ensuring the continuity of injection molding and improving processing efficiency. During injection molding, the injection molding channel is in a normal flow state. After the material is filled into the corresponding mold forming unit, the sealing plug plate 2 first blocks the passage of the injection molding channel, and then the piston is pushed forward by the reset cylinder for a predetermined distance, pushing the remaining material in the injection molding channel toward the position of the sealing plug plate 1, compressing the material, increasing the density of the material, and making the material entering the mold forming unit filled tightly. Then, the sealing plug plate 1 is inserted downward into the injection molding channel. In this process, the air pressure in the reset cylinder disappears, the piston automatically resets and is sealed and connected to the sealing plug plate 2, thereby preventing the injection liquid on both sides from flowing back, avoiding the volume change of the plastic part caused by the backflow, ensuring the dimensional accuracy of the plastic part, and improving the production quality of the plastic part.

[0027] 2. After injection molding, the movable platen continues to slide close to the fixed platen 2, and the upper cleaning component enters the upper middle part of the fixed platen 1 and the movable platen under the sliding of the linear guide rail 2, and the cleaning component is pushed downward by the electric push rod, so that the cleaning component is matched with the mold base 1 and the mold base 2 at the same height, which is convenient for cleaning the mold base 1 and the mold base 2. The dry ice particles in the cleaning box are accelerated by high-pressure air and pass through the inside of the feed pipe, the telescopic pipe and the distribution pipe in turn, and the dry ice particles are sprayed out through the nozzles on the straight pipe rotating in different directions and the side pipe to clean the inner cavity of the mold base 2 in multiple directions. The dry ice particles collide with the surface of the mold base 2, quickly sublimate into gas, and produce a strong physical impact, which quickly freezes and brittles the residue on the surface of the mold base 2 and peels it off; similarly, the mold base 1 is cleaned in the same way. The use of dry ice cleaning can penetrate into the gaps and grooves of the mold molding unit, clean the dead corners, ensure the thorough cleaning of the surface of the mold molding unit, maintain the accuracy of the mold molding unit, thereby improving production efficiency and product quality.

[0028] 3. By rotating the cylinder half a circle, the angle of the cleaning component is changed to adapt to the cleaning of the corresponding mold base 1 and mold base 2 on the movable mold plate and the fixed mold plate 2, thereby improving applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0030] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0031] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A;

[0032] Figure 3 It is a schematic diagram of the installation structure of the cleaning component of the present invention;

[0033] Figure 4 It is a three-dimensional structural schematic diagram of the mounting plate of the present invention;

[0034] Figure 5 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0035] Figure 6 It is a schematic diagram of the internal structure of the driving seat of the present invention;

[0036] Figure 7 It is a structural schematic diagram of the anti-backflow sealing assembly of the present invention in motion state 1;

[0037] Figure 8 It is a structural schematic diagram of the second motion state of the anti-backflow sealing assembly of the present invention.

[0038] In the figure: 1, storage box; 2, hopper; 3, injection channel; 4, drive seat; 5, moving plate; 6, fixed plate 1; 7, fixed plate 2; 8, slide bar; 9, top plate; 10, cleaning box; 11, connecting plate; 12, missing groove; 13, linear guide 1; 14, linear guide 2; 15, electric push rod; 16, mounting plate; 17, rotating cylinder; 18, support rod; 19, clamping drive member; 20, docking part 1; 21, Connecting part 2; 22, side through pipe; 23, connecting gear 1; 24, feeding pipe; 25, telescopic pipe; 26, material distribution pipe; 27, straight through pipe; 28, bevel gear; 29, nozzle; 30, arc through groove; 31, connecting gear 2; 32, rotating rod; 33, limit straight groove; 34, limit arc groove; 35, sealing plug plate 1; 36, sealing plug plate 2; 37, piston; 38, spring; 39, reset cylinder; 40, limit shaft. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0040] See also Figure 1-Figure 8As shown, the present invention provides an anti-backflow injection molding machine, including a material storage box 1 installed on the top surfaces of both sides of a base, a mold forming unit for alternate use is installed between the two material storage boxes 1, the mold forming unit includes a fixed mold plate 1 6 and a fixed mold plate 2 7 fixedly connected to the top surface of the base plate, a movable mold plate 5 is slidably arranged between the fixed mold plate 1 6 and the fixed mold plate 2 7, and the mold base 1 on both sides of the movable mold plate 5 is respectively used in conjunction with the fixed mold plate 1 6 and the mold base 2 installed on the fixed mold plate 2 7, an injection channel 3 is installed on the inner side of the material storage box 1, and an end of the injection channel 3 is connected to the fixed mold plate 1 6 The end of the other injection channel 3 is connected to the fixed mold plate 2 7. The edge of the injection channel 3 near the fixed mold plate 1 6 or the fixed mold plate 2 7 is fixedly provided with a drive seat 4. The interior of the drive seat 4 is provided with an anti-backflow sealing component. The anti-backflow sealing component includes a sealing plug plate 2 36 and a sealing plug plate 1 35 which are slidably plugged with the injection channel 3. The sealing plug plate 2 36 and the sealing plug plate 1 35 do not move in contact with the bottom of the inner cavity of the injection channel 3 at the same time, and the sealing plug plate 2 36 and the sealing plug plate 1 35 both slide with the inner wall of the drive seat 4. The side sealing connection of the sealing plug plate 2 36 has an automatic return spring. The piston 37 is positioned and pushes the material in the injection channel 3, and the interior of the sealing plug plate 2 36 is embedded with a reset cylinder 39 for pushing the piston 37 to move linearly; the tops of the fixed template 1 6 and the fixed template 2 7 are successively installed with a connecting plate 11 and a top plate 9, and the bottom surface of the top plate 9 is provided with a linear guide rail 2 14, and an electric push rod 15 is installed on the sliding seat outside the linear guide rail 2 14. The pushing end of the electric push rod 15 is provided with a rotating unit for adjusting the cleaning direction, and the rotating unit includes a rotating cylinder 17, and the driving end of the rotating cylinder 17 is equipped with a mold forming machine for alternate use. The cleaning component of the unit cleaning, in the use state, the fixed plate 1 6 and the movable plate 5 in the mold forming unit are a group, and the fixed plate 2 7 and the movable plate 5 are another group, which are used alternately. When the fixed plate 2 7 is injected by the corresponding storage box 1, the movable plate 5 moves toward the fixed plate 1 6, so that the mold base 2 on the fixed plate 1 6 cooperates with the mold base 1 on the movable plate 5, and then the other storage box 1 continues to inject material, ensuring the continuity of injection molding and improving processing efficiency. During each injection molding, the material enters the corresponding mold forming unit through the injection channel 3, see Figure 6As shown in the figure, it is the initial position of the sealing plug plate 2 36 and the sealing plug plate 1 35. When the material is filled into the corresponding mold forming unit, the injection channel 3 is in a normal flow state. First, the sealing plug plate 2 36 blocks the passage of the injection channel 3 to block the flow of the injection material in the storage box 1. In this process, the sealing plug plate 1 35 reaches the middle of the injection channel 3, and then the piston 37 is pushed forward by the reset cylinder 39 by a predetermined distance, pushing the remaining material in the injection channel 3 toward the position of the sealing plug plate 1 35, compressing the material, increasing the density of the material, and making the material entering the mold forming unit filled tightly. Then, the sealing plug plate 1 35 is inserted downward into the injection channel 3. After the sealing plug plate 1 35 and the sealing plug plate 2 36 are sealed, in this process, the air pressure in the reset cylinder 39 disappears. Since a slow-release valve is installed on the air path of the reset cylinder 39, the reset cylinder 3 9 When the action stops, the air pressure is gradually released, and the release speed of the air pressure is controlled to gradually reduce the air pressure to zero, so as to avoid the retreat and vibration of the sealing plug plate 2 due to sudden pressure relief. Then the piston 37 is automatically reset and sealed with the sealing plug plate 2 36 to prevent the injection liquid from flowing back, and avoid the volume change of bubbles, cavities or defects inside the plastic part caused by the backflow, so as to ensure the dimensional accuracy of the plastic part and improve the production quality of the plastic part. After injection molding, the movable template 5 continues to slide, and the upper cleaning component enters the upper middle part of the fixed template 1 6 and the movable template 5 under the sliding of the linear guide rail 2 14, and the cleaning component is pushed downward by the electric push rod 15, so that the cleaning component is matched with the mold base 1 and the mold base 2 at the same height, so as to facilitate the cleaning of the mold base 1 and the mold base 2, and the angle of the cleaning component is changed by rotating the rotary cylinder 17 180 degrees, so as to adapt to the cleaning of the movable template 5 and the mold base on the fixed template 2 7, and improve the applicability.

[0041] See also Figure 6-Figure 8 As shown, the driving seat 4 is internally rotatably installed with two mutually meshing connecting gears 2 31, and the shaft of each connecting gear 2 31 is fixedly sleeved with a rotating rod 32 on the outside, and the initial positions of the two rotating rods 32 are different. The rotating rod 32 includes a straight section and a guide section. The tops of the sealing plug plate 1 35 and the sealing plug plate 2 36 are fixed with a limit shaft 40 that slides in the straight section and the guide section. A spring 38 is installed between the piston 37 and the sealing plug plate 2 36. Through the connection of the spring 38, when the piston 37 is pushed to move in the injection channel 3, the spring 38 is stretched, and when the air pressure disappears, the spring 38 at this time returns to the initial position, and pulls the piston 37 to reset and seal with the sealing plug plate 2 36;

[0042] A limiting straight groove 33 is provided on the straight section, and a limiting arc groove 34 connected to the end of the limiting straight groove 33 is provided on the guide section. The limiting shaft 40 slides in the limiting straight groove 33 and the limiting arc groove 34, and the limiting arc groove 34 has the same center as the connecting gear 2 31. Initially, the injection channel 3 is in a flow state. Since the two rotating rods 32 are meshed and transmitted through the connecting gear 2 31, the rotation of one rotating rod 32 causes the limiting shaft 40 on the sealing plug plate 2 36 to slide in the limiting straight groove 33 in the rotating rod 32. At this time, the sealing plug plate 2 36 is inserted into the injection channel 3. The passage of the injection channel 3 is blocked to prevent the material from flowing, and then the piston 37 is used to push the remaining material in the injection channel 3 toward the position of the sealing plug plate 1 35 to compress the material and increase the density of the material entering the mold forming unit. After the limiting shaft 40 on the sealing plug plate 2 36 enters the limiting arc groove 34, the position of the sealing plug plate 2 36 does not change. Then, another rotating rod 32 rotates to drive the sealing plug plate 1 35 to be inserted into the injection channel 3. Through the sealing plug plate 1 35 and the sealing plug plate 2 36, double protection is provided to prevent the injection liquid from flowing back.

[0043] Figure 6 The sealing plug plate 1 35 and the sealing plug plate 2 36 are in the initial position. At this time, the limiting shaft 40 of the sealing plug plate 1 35 is located at one end of the limiting straight groove 33; the limiting shaft 40 of the sealing plug plate 2 36 is located in the middle of the limiting straight groove 33. At this time, the sealing plug plate 2 36 is located in the middle of the injection channel 3, and the injection liquid can still flow normally.

[0044] During an exercise, Figure 7 As shown, the rotating rod 32 on one side rotates, pushing the sealing insert plate 2 36 to move downward from the middle of the injection channel 3, and contacting with the bottom surface to achieve sealing, thereby blocking the injection channel 3. At this time, the limiting shaft 40 reaches the connection between the limiting straight groove 33 and the limiting arc groove 34; the rotating rod 32 on the other side continues to move at the same time, and the sealing insert plate 1 35 is inserted into the middle of the injection channel 3. At this time, the limiting shaft 40 of the sealing insert plate 1 35 reaches the middle from one end of the limiting straight groove 33. At the same time, the piston 37 is pushed forward by the reset cylinder 39;

[0045] During secondary movement, Figure 8 As shown, the sealing plug plate 2 36 is still sealed with the injection channel 3, and the limiting shaft 40 at this time slides into the limiting arc groove 34, and the limiting shaft 40 in the sealing plug plate 1 35 reaches the connection between the limiting straight groove 33 and the limiting arc groove 34, and then the sealing plug plate 1 35 is abutted against the inner cavity of the injection channel 3, playing a secondary sealing role, that is, before the sealing plug plate 1 35 blocks the injection channel 3, the injection material has completely filled the mold cavity and reached the required pressure state, and the injection pressure and injection time are monitored by the equipment.

[0046] See also Figure 3 and Figure 4 As shown, a mounting plate 16 is fixedly provided on the outside of the pushing end of the electric push rod 15, and an arc-shaped through groove 30 with different arc lengths and directions is provided on the outside of the mounting plate 16. A support rod 18 is slidably installed inside the arc-shaped through groove 30, and the end of the support rod 18 is fixed to the cleaning component. Since the mounting plate 16 is fixed to the outside of the pushing end of the electric push rod 15, the mounting plate 16 moves with the pushing end of the electric push rod 15. When the rotating cylinder 17 rotates, the cleaning component is driven to rotate together. At this time, the support rod 18 slides in the corresponding arc-shaped through groove 30 to assist in supporting the stability of the cleaning component.

[0047] See also Figure 1 , Figure 3 and Figure 5 As shown, a cleaning box 10 for storing dry ice particles is installed on the top of the top plate 9, and the cleaning assembly includes a clamping drive 19, which is a clamping cylinder, and one driving end of the clamping drive 19 is connected to a docking part 20 adapted to the mold base 2 on the fixed mold plate 1 6, and the other driving end of the clamping drive 19 is connected to a docking part 21 adapted to the mold base 1 on the movable mold plate 5, and a feeding pipe 24 connected to the cleaning box 10 is installed between the docking part 1 20 and the docking part 2 21. When the cleaning unit reaches the upper middle part of the fixed mold plate 1 6 and the movable mold plate 5, the electric push rod 15 pushes the cleaning unit downward, that is, the docking part 20 is adapted to the mold base 2 on the fixed mold plate 1 6 at the same height, and the docking part 21 is adapted to the mold base 1 on the movable mold plate 5 at the same height, which is convenient for cleaning;

[0048] During cleaning, a feed pipe 26 is embedded in one side surface of the docking part 20, and the dry ice particles in the cleaning box 10 are accelerated by high-pressure air to enter the feed pipe 24 and the feed pipe 26. A telescopic tube 25 is installed between the feed pipe 26 and the feed pipe 24. When the docking part 20 and the docking part 21 are pushed away from each other by the clamping drive member 19, normal feeding is achieved through the telescopic tube 25. A plurality of straight-through tubes 27 are rotatably installed on the side of the docking part 20 away from the feed pipe 26. Each straight-through tube 27 is rotatably set with the feed pipe 26, and the outer surface of each straight-through tube 27 is sleeved with a connecting gear 23 for meshing transmission. The four side surfaces of the inner cavity of the docking part 20 are rotatably installed on one side facing the fixed template 1 or the fixed template 27, and the outer surfaces of the corresponding side tubes 22 are fixedly sleeved with mutually meshing bevel gears 28, and the ends of the side tubes 22 and the straight tubes 27 are fixed with spray The head 29, the side through pipe 22 and the corresponding straight through pipe 27 rotate in coordination. Since the adjacent straight through pipes 27 rotate in different directions, the corresponding nozzles 29 are driven to rotate together to clean the cavity bottom of the mold base 2, thereby improving the cleaning efficiency. Driven by the bevel gear 28, the side through pipe 22 rotates at the same time to drive the corresponding nozzles 29 to rotate, thereby cleaning the inner wall surface of the mold base 2. Dry ice particles are sprayed out through the straight through pipe 27 rotating in different directions and the nozzles 29 on the side through pipe 22 to clean the mold base 2. During cleaning, the dry ice particles collide with the surface of the mold base 2, and quickly sublimate into gas to produce a strong physical impact, thereby quickly freezing and brittle the residue on the surface of the mold base 2 and peeling it off. Similarly, the mold base 1 is cleaned in the same way. The use of dry ice cleaning can penetrate into the gaps and grooves of the mold molding unit, clean dead corners, ensure the thorough cleaning of the surface of the mold molding unit, and maintain the accuracy of the mold molding unit, thereby improving production efficiency and product quality.

[0049] A slide bar 8 is fixedly installed at the edge position between the fixed mold plate 1 6 and the fixed mold plate 2 7, a linear guide rail 13 is installed on the bottom surface of the connecting plate 11, the slide seat outside the linear guide rail 13 is fixedly connected to the movable mold plate 5, the movable mold plate 5 and the slide bar 8 are slidably arranged, and a groove 12 for the cleaning component to pass through is provided in the middle of the top surface of the movable mold plate 5, the movable mold plate 5 is driven by the linear guide rail 13 to slide between the fixed mold plate 1 6 and the fixed mold plate 2 7, and are used alternately for injection molding, when the cleaning component is cleaning the fixed mold plate 2 7 and the movable mold plate 5, the cleaning component slides with the linear guide rail 2 14 and passes through the groove 12, and then the rotating cylinder 17 drives the cleaning component to rotate half a circle to adapt to the cleaning of the cleaning component and the upper mold base 2 of the fixed mold plate 2 7 and the upper mold base 1 of the movable mold plate 5.

[0050] See also Figure 1 As shown, the top surface of each storage box 1 is provided with a hopper 2 for adding materials.

[0051] A working method of an anti-backflow injection molding machine, the working method comprising the following steps:

[0052] Step 1: After the injection molding of the movable mold plate 5 and the fixed mold plate 1 6 is completed, the movable mold plate 5 moves toward the fixed mold plate 2 7, and the movable mold plate 5 and the fixed mold plate 2 7 are alternately injected with materials through another material storage box 1;

[0053] Step 2: After the injection is completed, the second sealing plate 36 first blocks the passage of the injection channel 3, and the piston 37 moves forward a predetermined distance to push the remaining material in the injection channel 3 toward the position of the first sealing plate 35, and then the first sealing plate 35 is inserted downward into the injection channel 3 to prevent the injection liquid from flowing back;

[0054] Step 3: After that, the cleaning assembly slides on the linear guide rail 14 to the middle of the upper part of the fixed plate 1 6 and the movable plate 5, and the electric push rod 15 pushes the cleaning assembly downward, so that the docking part 1 20 and the docking part 2 21 are respectively at the same height as the die base 1 and the die base 2 on the sides of the fixed plate 1 6 and the movable plate 5, and the clamping drive 19 drives the docking part 1 20 to match the die base 2, and the docking part 2 21 to match the die base 1;

[0055] Step 4: During cleaning, the dry ice particles in the cleaning box 10 are accelerated by high-pressure air and pass through the inside of the feeding pipe 24, the telescopic pipe 25 and the distribution pipe 26 in turn, and the dry ice particles are sprayed out through the straight pipe 27 rotating in different directions and the nozzle 29 on the side pipe 22 to clean the inner cavity of the mold base 2 in multiple directions. The dry ice particles collide with the surface of the mold base 2, quickly sublimate into gas, and produce a strong physical impact, which quickly freezes and brittles the residue on the surface of the mold base 2 and peels it off; similarly, the mold base 1 is cleaned in the same way.

[0056] When the present invention is in use, the fixed platen 1 6 and the movable platen 5, as well as the movable platen 5 and the fixed platen 2 7 are used alternately. After the fixed platen 2 7 is injected by the corresponding material storage box 1, the movable platen 5 moves toward the fixed platen 1 6, so that the die base 2 on the fixed platen 1 6 cooperates with the die base 1 on the movable platen 5, and then the other material storage box 1 continues to inject materials, thereby ensuring the continuity of injection molding and improving processing efficiency.

[0057] During injection molding, the injection channel 3 is in a normal flow state. After the material is filled into the corresponding mold forming unit, the sealing plug plate 2 36 first blocks the passage of the injection channel 3, and then the piston 37 is pushed forward by the reset cylinder 39 to advance a predetermined distance, pushing the remaining material in the injection channel 3 to the position of the sealing plug plate 1 35, compressing the material, increasing the density of the material, and making the material entering the mold forming unit compact. Then, the sealing plug plate 1 35 is inserted downward into the injection channel 3. In this process, the air pressure in the reset cylinder 39 disappears. Since a slow-release valve is installed on the air path of the reset cylinder 39, the air pressure is gradually released when the reset cylinder 39 stops moving. The air pressure release speed is controlled to gradually reduce the air pressure to zero, avoiding the retreat and vibration of the sealing plug plate 2 due to sudden pressure relief. The piston 37 automatically resets and is sealed and connected to the sealing plug plate 2 36 to prevent the injection liquid from flowing back, and avoid the volume change of bubbles, cavities or defects inside the plastic part caused by the backflow, thereby ensuring the dimensional accuracy of the plastic part and improving the production quality of the plastic part.

[0058] After injection molding, the movable template 5 continues to slide close to the fixed template 2 7, and the upper cleaning component enters the upper middle part of the fixed template 1 6 and the movable template 5 under the sliding of the linear guide rail 2 14, and the cleaning component is pushed downward by the electric push rod 15, so that the cleaning component is matched with the mold base 1 and the mold base 2 at the same height, so as to facilitate the cleaning of the mold base 1 and the mold base 2. The dry ice particles in the cleaning box 10 are accelerated by high-pressure air and pass through the inside of the feed pipe 24, the telescopic pipe 25 and the distribution pipe 26 in turn, and the dry ice particles are sprayed out through the nozzles 29 on the straight pipe 27 rotating in different directions and the side pipe 22 to clean the inner cavity of the mold base 2 in multiple directions. The dry ice particles collide with the surface of the mold base 2, quickly sublimate into gas, and produce a strong physical impact, so that the residue on the surface of the mold base 2 is quickly frozen, brittle and peeled off; similarly, the mold base 1 is cleaned in the same way. The use of dry ice cleaning can penetrate into the gaps and grooves of the mold molding unit, clean the dead corners, ensure the thorough cleaning of the surface of the mold molding unit, maintain the accuracy of the mold molding unit, thereby improving production efficiency and product quality.

[0059] By rotating the rotary cylinder 17 half a circle, the angle of the cleaning component is changed, so as to adapt to the cleaning of the corresponding mold base 1 and mold base 2 on the movable mold plate 5 and the fixed mold plate 2 7, thereby improving the applicability.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An anti-backflow injection molding machine, characterized in that: It comprises a material storage box (1) mounted on the top surfaces of both sides of a base, a mold forming unit for alternate use is mounted between the two material storage boxes (1), the mold forming unit comprises a fixed mold plate (6) and a fixed mold plate (7) fixedly connected to the top surface of the base plate, a movable mold plate (5) is slidably arranged between the fixed mold plate (6) and the fixed mold plate (7), a mold base (1) on both sides of the movable mold plate (5) is respectively used in conjunction with the fixed mold plate (6) and the mold base (2) mounted on the fixed mold plate (7), an injection channel (3) is mounted on the inner side of the material storage box (1), one end of the injection channel (3) is connected to the fixed mold plate (6), and the other end of the injection channel (3) is connected to the fixed mold plate (7), a drive seat (4) is fixedly arranged on the edge of the injection channel (3) close to the fixed mold plate (6) or the fixed mold plate (7), and an anti-backflow sealing component is arranged inside the drive seat (4); The anti-backflow sealing component comprises a sealing plug plate 2 (36) and a sealing plug plate 1 (35) which are slidably plugged into the injection channel (3); the sealing plug plate 2 (36) and the sealing plug plate 1 (35) are not in motion contact with the bottom of the inner cavity of the injection channel (3) at the same time; a piston (37) which automatically resets and pushes the material in the injection channel (3) is sealedly connected to the side of the sealing plug plate 2 (36); and a reset cylinder (39) for pushing the piston (37) to move linearly is embedded in the interior of the sealing plug plate 2 (36); A connecting plate (11) and a top plate (9) are installed on the top of the fixed mold plate 1 (6) and the fixed mold plate 2 (7) in sequence; a linear guide rail 2 (14) is provided on the bottom surface of the top plate (9); an electric push rod (15) is installed on a sliding seat outside the linear guide rail 2 (14); a rotating unit for adjusting a cleaning direction is provided at a pushing end of the electric push rod (15); the rotating unit comprises a rotating cylinder (17); a cleaning component for cleaning alternately used mold forming units is installed at a driving end of the rotating cylinder (17).

2. The anti-backflow injection molding machine according to claim 1, characterized in that: The driving seat (4) is internally rotatably mounted with two mutually meshing connecting gears (31), the shaft of each connecting gear (31) being externally fixedly sleeved with a rotating rod (32), the two rotating rods (32) having different initial positions, the rotating rod (32) comprising a straight section and a guide section, the tops of the sealing plug plate (35) and the sealing plug plate (36) being fixed with a limiting shaft (40) sliding in the straight section and the guide section, and a spring (38) being mounted between the piston (37) and the sealing plug plate (36).

3. The anti-backflow injection molding machine according to claim 2, characterized in that: The straight section is provided with a limiting straight groove (33), the guide section is provided with a limiting arc groove (34) connected to the end of the limiting straight groove (33), the limiting shaft (40) slides in the limiting straight groove (33) and the limiting arc groove (34), and the limiting arc groove (34) has the same center as the connecting gear 2 (31).

4. The anti-backflow injection molding machine according to claim 3, characterized in that: A mounting plate (16) is fixedly arranged on the outside of the pushing end of the electric push rod (15); arc-shaped through grooves (30) of different arc lengths and directions are arranged on the outside of the mounting plate (16); a support rod (18) is slidably mounted inside the arc-shaped through groove (30); and the end of the support rod (18) is fixed to the cleaning component.

5. The anti-backflow injection molding machine according to claim 4, characterized in that: A cleaning box (10) for storing dry ice particles is installed on the top of the top plate (9), and the cleaning assembly comprises a clamping drive member (19), one driving end of the clamping drive member (19) is connected to a docking portion (20) adapted to a mold base (2) on a fixed mold plate (6), and the other driving end of the clamping drive member (19) is connected to a docking portion (21) adapted to a mold base (1) on a movable mold plate (5), and a material conveying pipe (24) communicating with the cleaning box (10) is installed between the docking portion (20) and the docking portion (21).

6. The anti-backflow injection molding machine according to claim 5, characterized in that: A material distribution pipe (26) is embedded and installed on one side surface of the docking part (20), and a telescopic pipe (25) is installed between the material distribution pipe (26) and the material conveying pipe (24). A plurality of straight-through pipes (27) are rotatably installed on a side of the docking part (20) away from the material distribution pipe (26). Each of the straight-through pipes (27) is rotatably arranged with the material distribution pipe (26), and the outer surface of each straight-through pipe (27) is sleeved with a connecting gear (23) for meshing transmission. Side-through pipes (22) are rotatably installed on the four side surfaces of the inner cavity of the docking part (20) facing the fixed mold plate (6) or the fixed mold plate (7). At least one straight-through pipe (27) and the outer surface of the corresponding side-through pipe (22) are fixedly sleeved with mutually meshing bevel gears (28). Spray heads (29) are fixed at the ends of the side-through pipe (22) and the straight-through pipe (27), and the side-through pipe (22) and the corresponding straight-through pipe (27) are rotatably matched.

7. The anti-backflow injection molding machine according to claim 6, characterized in that: A slide bar (8) is fixedly installed at the edge position between the fixed mold plate 1 (6) and the fixed mold plate 2 (7), and a linear guide rail 1 (13) is installed on the bottom surface of the connecting plate (11). The sliding seat outside the linear guide rail 1 (13) is fixedly connected to the movable mold plate (5). The movable mold plate (5) and the slide bar (8) are slidably arranged, and a notch (12) for the cleaning component to pass through is provided in the middle of the top surface of the movable mold plate (5).

8. The anti-backflow injection molding machine according to claim 7, characterized in that: The top surface of each material storage box (1) is provided with a hopper (2) for adding material.

9. The working method of the anti-backflow injection molding machine according to claim 8, characterized in that: The working method comprises the following steps: Step 1: After the injection molding of the movable mold plate (5) and the fixed mold plate 1 (6) is completed, the movable mold plate (5) moves toward the fixed mold plate 2 (7), and the movable mold plate (5) and the fixed mold plate 2 (7) are alternately injected with materials through another material storage box (1); Step 2: After the injection is completed, the second sealing plate (36) first blocks the passage of the injection channel (3), and the piston (37) is pushed forward a predetermined distance to push the remaining material in the injection channel (3) toward the position of the first sealing plate (35). Then, the first sealing plate (35) is inserted downward into the injection channel (3) to prevent the injection liquid from flowing back. Step 3: The cleaning component then slides along the linear guide rail 2 (14) into the middle of the upper portion of the fixed mold plate 1 (6) and the movable mold plate (5), and the electric push rod (15) pushes the cleaning component downward, so that the docking portion 1 (20) and the docking portion 2 (21) are respectively at the same height as the mold base 1 and the mold base 2 on the sides of the fixed mold plate 1 (6) and the movable mold plate (5), and the clamping drive member (19) drives the docking portion 1 (20) to match the mold base 2, and the docking portion 2 (21) to match the mold base 1; Step 4: During cleaning, the dry ice particles in the cleaning box (10) are accelerated by high-pressure air and pass through the inside of the feed pipe (24), the telescopic pipe (25) and the distribution pipe (26) in sequence, and the dry ice particles are sprayed out through the nozzles (29) on the straight pipe (27) and the side pipe (22) rotating in different directions to clean the inner cavity of the mold base 2 in multiple directions. The dry ice particles collide with the surface of the mold base 2 and quickly sublimate into gas to produce a strong physical impact, which quickly freezes and embrittles the residue on the surface of the mold base 2 and peels it off; similarly, the mold base 1 is cleaned in the same way.

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