Forming device used for environment-friendly plastic production and provided with rapid forming mechanism

Abstract

The invention discloses a forming device used for environment-friendly plastic production and provided with a rapid forming mechanism, and relates to the technical field of plastic injection molding.The forming device comprises a discharging mechanism, an injection mechanism, a mold closing mechanism and a heating mechanism, the injection mechanism further comprises an injection assembly, a plug block and an injection nozzle, the injection assembly is arranged in an injection pipe, and the plug block is arranged in the injection pipe; the injection pipe is communicated with the injection nozzle, a pouring gate is formed in the injection end of a mold cavity of a fixed mold in the mold closing mechanism, the pouring gate is communicated with the injection end of a forming mold cavity, an injection assembly is used for pushing molten plastic raw materials into the pouring gate through the injection nozzle, and a blocking block is arranged in the fixed mold in a sliding mode; when the injection assembly pushes plastic raw materials in the injection pipe to the pouring gate, the blocking block is located at the opening position, and the injection nozzle is communicated with the pouring gate. When the injection assembly supplements materials to the injection area in the injection pipe, the blocking block is located at the initial position, and the pouring gate is not communicated with the injection nozzle; the forming device can seal the pouring gate during part taking, and plastic in the injection nozzle is prevented from being in contact with air to be oxidized.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastic injection molding, and particularly relates to a molding device with a rapid molding mechanism for the production of environmentally friendly plastics. Background Art

[0002] Environmentally friendly plastic materials can be degradable plastics, recycled plastics, plant-based plastics, etc. By using environmentally friendly plastics, not only can resource waste and environmental pollution be effectively reduced, but also the balance between production efficiency and material sustainability can be achieved. In the molding processing technology of environmentally friendly plastics, plastic injection molding is one of the manufacturing processes that conforms to the concept of green production and is also one of the most common processing methods for plastic products.

[0003] Existing plastic injection molding equipment generally includes a mold, a heating and plasticizing mechanism, an injection mechanism, etc. Plastic raw materials are heated and plasticized by the heating and plasticizing mechanism and then transported to the injection mechanism. The injection mechanism then injects the molten plastic into the mold through an injection pipe. After injection, during the process of taking out the molded plastic part, the injection nozzle of the injection pipe is exposed to the air, making the molten plastic raw materials remaining inside the injection nozzle easy to cool and solidify after injection, causing blockage of the injection nozzle of the injection pipe, which is not conducive to the normal operation of subsequent plastic injection molding equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a molding device with a rapid molding mechanism for the production of environmentally friendly plastics, which has a simple structure and a reasonable design, in order to solve the above problems.

[0005] The present invention achieves the above purpose through the following technical solutions: A molding device with a rapid molding mechanism for the production of environmentally friendly plastics includes a feeding mechanism, an injection mechanism, a mold closing mechanism, and a heating mechanism arranged outside the injection pipe in the injection mechanism. The heating mechanism is used to melt and heat the plastic raw materials in the injection pipe. The injection mechanism is used to inject the molten plastic raw materials into the molding cavity in the mold closing mechanism. The injection mechanism further includes an injection component, a blocking block, and an injection nozzle. The injection component is arranged in the injection pipe. One end of the injection pipe adjacent to the mold closing mechanism is fixedly connected with the injection nozzle. The injection cavity opened in the injection nozzle is communicated with the material cavity of the injection pipe. Among them, the mold closing mechanism includes a fixed mold. A gate is opened at the injection end of the mold cavity of the fixed mold. The gate is communicated with the injection end of the molding cavity. The injection component is used to push the molten plastic raw materials through the injection nozzle into the gate. The blocking block is slidably arranged in the fixed mold. One end of the blocking block away from the injection nozzle is fixedly connected with a first spring. The first spring is fixedly connected with the fixed mold; When the injection component pushes the liquid plastic raw material in the injection tube to the gate, the plug is located at the opening position under the hydraulic pressure of the liquid plastic raw material, and the injection nozzle is in communication with the gate; when the injection component replenishes the material in the injection area of the injection tube, the plug is located at the initial position, and the gate is not in communication with the injection nozzle.

[0006] As a further optimized solution of the present invention, the injection component includes a driving assembly, a screw rod, and a check ring. The output end of the driving assembly is connected to the input end of the screw rod. The screw rod penetrates through the injection tube and is slidably connected to the injection tube. One end of the screw rod located inside the injection tube is fixedly connected with a screw rod cone portion. A check ring is sleeved at a position adjacent to the screw rod cone portion of the screw rod. The check ring is slidably connected to the injection tube. The transmission component in the driving assembly is used to drive the screw rod to rotate, and the reciprocating component in the driving assembly is used to drive the screw rod to reciprocate. The feeding mechanism includes a feed cylinder, and the feed cylinder is communicated with the injection tube through a feed pipe.

[0007] As a further optimized solution of the present invention, the transmission component includes a motor and a transmission shaft. The output end of the motor is fixedly connected with the transmission shaft, and the output end of the transmission shaft is in transmission connection with the screw rod. The reciprocating component includes a displacement driving member, a displacement telescopic rod, a sliding seat, and a sliding rail. The motor is fixedly arranged on the sliding seat, the sliding seat is slidably connected to the sliding rail, and the sliding rail is fixedly arranged on the workbench through a base.

[0008] As a further optimized solution of the present invention, the heating mechanism includes a first heating member and a second heating member. The first heating member is arranged outside the injection tube, and the first heating member is used to melt and heat the solid plastic raw material in the injection tube into a liquid state. The second heating member is arranged outside the injection nozzle, and the second heating member is used to heat and keep warm the plastic in the injection nozzle.

[0009] As a further optimized solution of the present invention, the number of the first heating members is multiple, and the multiple first heating members are sequentially arranged along the axial line direction of the injection tube. And along the direction of the injection tube close to the mold clamping mechanism, the heating temperature of the plastic in the injection tube by the first heating member gradually increases.

[0010] As a further optimized solution of the present invention, the fixed mold includes a housing and a mounting block. One side of the housing facing the injection pipe is provided with a gate. One side of the housing facing the molding cavity is fixedly installed with a mounting block. A feeding pipeline and a connecting pipeline are respectively arranged in the mounting block. The output end of the feeding pipeline is communicated with the injection end of the molding cavity. The feeding pipeline is communicated with the gate through the connecting pipeline, and the axis line of the feeding pipeline is parallel and non-collinear with the axis line of the gate. Among them, the cross-sectional dimension value of the feeding pipeline, the cross-sectional dimension value of the connecting pipeline, and the cross-sectional dimension value of the gate increase in sequence. Among them, the blocking block is slidably installed in the mounting block, the first spring is fixedly connected with the mounting block, and the sliding direction of the blocking block is consistent with the axis line direction of the gate; One side of the housing facing the injection pipe is provided with an abutting groove, and the abutting groove is circumferentially located outside the gate. The injection end of the injection nozzle is provided with an abutting inclined surface, and the abutting inclined surface is in abutting fit with the abutting groove.

[0011] As a further optimized solution of the present invention, the injection mechanism further includes a scraping component, and the scraping component is arranged in the injection nozzle. The scraping component is used to gather the residual plastic raw materials in the injection nozzle into the injection pipe.

[0012] As a further optimized solution of the present invention, the scraping component includes a scraping driving part, a support ring and a baffle. A plurality of baffles are rotatably connected to the support ring, and the output end of the scraping driving part is in transmission connection with the baffle. Among them, there is a material passing gap between the support ring and the inner wall of the injection nozzle; When the screw pushes the liquid plastic raw material in the injection pipe to the gate, the support ring is located at a position near the gate end in the injection nozzle, and a plurality of the baffles rotate to the unfolded position; when the screw starts to reset and move, under the drive of the scraping driving part, the baffles rotate to the closed position.

[0013] As a further optimized solution of the present invention, the scraping driving part includes a diversion seat, a baffle, a traction rod, a second spring, a main magnetic block and a sub-magnetic block. The diversion seat is fixedly arranged in the injection nozzle. A slider is slidably connected to the diversion seat through a chute, and the slider is fixedly connected with the support ring. Among them, the diversion seat is located below the support ring. A sub-magnetic block is embedded at one end of the baffle away from the support ring. A traction rod is slidably connected in the conical part of the screw. A moving block is fixedly connected to one end of the traction rod inside the conical part of the screw. A second spring is sleeved on the side of the traction rod between the moving block and the conical part of the screw. A main magnetic block is embedded at one end of the traction rod outside the conical part of the screw. Among them, the baffle is fixedly arranged in the injection nozzle, and the baffle is located at a position between the support ring and the conical part of the screw; When the screw starts to reset and move, the main magnetic block and the sub-magnetic block are magnetically attracted and abutted, the baffle rotates to the closed position, and the baffle drives the support ring to move towards the injection pipe until the support ring abuts against the baffle.

[0014] As a further optimized solution of the present invention, along the axial line direction of the injection nozzle and in the direction from the injection pipe to the gate, the wall thickness of the diversion seat gradually increases, and the inner wall of the diversion seat is inclined.

[0015] The present invention has at least the following beneficial effects: A molding device with a rapid prototyping mechanism for environmental protection plastic production provided by the present invention is provided with a feeding mechanism, an injection mechanism, a mold clamping mechanism, and a heating mechanism arranged outside the injection pipe in the injection mechanism. With the help of the screw in the injection mechanism, the molten plastic raw material is injected from the injection pipe into the injection nozzle, and further injected into the molding cavity in the mold clamping mechanism through the connecting pipe and the injection pipe. When the injection is completed, when the screw moves back to its original position, due to the release of the pushing pressure of the screw on the plastic, the plug block returns to its original position under the action of the first spring, blocking the gate, so that when taking out the plastic product, the plastic at the gate position and in the injection nozzle will not contact the air, ensuring good heat preservation effect of the plastic at this position and avoiding solidification and blockage of the injection nozzle; Moreover, a second heating element is arranged outside the injection nozzle to keep the plastic in the injection nozzle and the connecting pipe in a molten state by heating, effectively avoiding cooling and solidification. In addition, through the scraping group arranged in the injection nozzle, the excessive residual molten plastic in the injection nozzle during the reset process of the screw is gathered into the injection pipe, making it receive a higher temperature and maintaining its fluidity in the molten state, facilitating the smooth injection of the plastic when performing injection molding processing again; At the same time, by setting a material passing gap between the support ring and the inner wall of the injection nozzle, when the support ring drives the baffle to push the material, the pushed molten plastic overflows to the side of the baffle away from the screw through the material passing gap between the support ring and the inner wall of the injection nozzle, so that the upper wall of the injection cavity of the injection nozzle after the baffle gathers is covered with part of the molten plastic to receive the heating of the second heating element, avoiding the situation that the inner wall of the injection nozzle has a bare blank area, resulting in the second heating element heating the injection nozzle in vain and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the partial structural schematic diagram of the injection driving assembly and the feeding mechanism in the injection mechanism of the present invention; Figure 3 is the Figure 1 front structural schematic diagram of the present invention; Figure 4 is the partial sectional structural schematic diagram of the fixed mold, the heating mechanism and the injection mechanism of the present invention; Figure 5 is the Figure 4 partial sectional structural schematic diagram of the fixed mold and the plug block in the injection mechanism of the present invention during the injection process; Figure 6 is a schematic diagram of a partial sectional view inside the fixed mold of the present invention; Figure 7 is a schematic diagram of a partial sectional view of the injection nozzle of the present invention; Figure 8 is a front view of the scraping component of the present invention during the scraping process; Figure 9 is a schematic diagram of the diversion seat, baffle, and damper in the scraping component of the present invention; Figure 10 is a schematic diagram of a partial sectional view of the traction rod and screw of the present invention in the initial position.

[0017] In the figure: 1, barrel; 11, blanking pipe; 2, injection mechanism; 211, displacement driving member; 212, displacement telescopic rod; 213, motor; 214, transmission shaft; 215, sliding seat; 216, slide rail; 217, base; 218, screw; 22, check ring; 23, screw taper; 24, diversion seat; 25, damper; 26, slider; 27, support ring; 28, baffle; 281, secondary magnet; 29, traction rod; 291, main magnet; 210, second spring; 201, moving block; 3, mold clamping mechanism; 31, fixed mold; 311, housing; 312, mounting block; 313, injection pipeline; 314, connecting pipeline; 315, abutting groove; 316, gate; 317, plug; 318, first spring; 4, heating mechanism; 411, first heating member; 412, second heating member; 42, injection pipe; 421, injection nozzle; 422, abutting inclined surface; 5, workbench; 6, controller. Detailed implementation manners

[0018] The following further describes the present application in detail with reference to the accompanying drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] In one embodiment, as Figure 1 , Figure 3 and Figure 4As shown in the figure, a molding device with a rapid prototyping mechanism for the production of environmentally friendly plastics provided by the present invention includes a feeding mechanism, an injection mechanism 2, a mold clamping mechanism 3, and a heating mechanism 4 provided outside the injection tube 42 in the injection mechanism 2. The heating mechanism 4 is used to melt and heat the plastic raw material in the injection tube 42. The injection mechanism 2 is used to inject the molten plastic raw material into the molding cavity in the mold clamping mechanism 3. The injection mechanism 2 further includes an injection assembly, a plug 317, and an injection nozzle 421. The injection assembly is arranged in the injection tube 42. One end of the injection tube 42 adjacent to the mold clamping mechanism 3 is fixedly connected with an injection nozzle 421. The injection cavity opened in the injection nozzle 421 is communicated with the material cavity of the injection tube 42. Among them, the mold clamping mechanism 3 includes a fixed mold 31. A gate 316 is opened at the injection end of the mold cavity of the fixed mold 31. The gate 316 is communicated with the injection end of the molding cavity. The injection assembly is used to push the molten plastic raw material through the injection nozzle 421 into the gate 316. The plug 317 is slidably arranged in the fixed mold 31. One end of the plug 317 away from the injection nozzle 421 is fixedly connected with a first spring 318. The first spring 318 is fixedly connected with the fixed mold 31; When the injection assembly pushes the liquid plastic raw material in the injection tube 42 to the gate 316, the plug 317 is located at the open position under the hydraulic pressure of the liquid plastic raw material. The injection nozzle 421 is communicated with the gate 316. At this time, the molten liquid plastic raw material is pressed into the gate 316 and further injected into the cavity between the fixed mold 31 and the moving mold (not marked in the figure) of the mold clamping mechanism 3, and the injection is advanced according to the material capacity required for the injection molding of the plastic part. When the injection assembly replenishes the injection area in the injection tube 42, at this time, the pressure applied to the mold cavity is released, so that the plug 317 moves in the direction close to the gate under the elastic force of the first spring 318 until the plug 317 is located at the initial position, that is, the gate 316 is not communicated with the injection nozzle 421. Thus, after the moving mold in the mold clamping mechanism 3 is opened to take out the injection-molded plastic product, the gate 316 will not be exposed to the air, avoiding continuous heat dissipation or even cooling and solidification during the process of taking out the part due to long-term contact with the outside air, resulting in the blockage of the injection end of the injection tube 42 communicated with the gate 316. Therefore, when the injection processing is carried out again later, the gate 316 is reopened so that the molten liquid plastic raw material can be smoothly injected, ensuring the normal operation of the plastic injection molding equipment.

[0020] Exemplarily, continue to refer to Figure 2 、 Figure 3 and Figure 4, the injection assembly includes a driving assembly, a screw 218, and a check ring 22. The output end of the driving assembly is connected to the input end of the screw 218. The screw 218 penetrates through the injection tube 42 and is slidably connected to the injection tube 42. One end of the screw 218 located inside the injection tube 42 is fixedly connected to a screw cone portion 23. A check ring 22 is sleeved on the screw 218 adjacent to the screw cone portion 23. The check ring 22 is slidably connected to the injection tube 42. The transmission component in the driving assembly is used to drive the screw 218 to rotate, and the reciprocating component in the driving assembly is used to drive the screw 218 to reciprocate; The feeding mechanism includes a material cylinder 1, and the material cylinder 1 is communicated with the injection tube 42 through a feeding tube 11.

[0021] Among them, as Figure 2 shown, the transmission component includes a motor 213 and a transmission shaft 214. The output end of the motor 213 is fixedly connected to the transmission shaft 214. The output end of the transmission shaft 214 is in transmission connection with the screw 218. The reciprocating component includes a displacement driving member 211, a displacement telescopic rod 212, a sliding seat 215, and a sliding rail 216. The motor 213 is fixedly arranged on the sliding seat 215. The sliding seat 215 is slidably connected to the sliding rail 216. The sliding rail 216 is fixedly arranged on the workbench 5 through a base 217.

[0022] It should be noted that the plastic raw materials used in the above embodiments are mostly plastic pellet raw materials, which are stored in the material cylinder 1 in advance and are orderly transported to the injection tube 42 through the feeding tube 11. Under the heating action of the heating mechanism 4, the plastic transported to the injection end of the injection tube 42 is molten liquid plastic. Specifically, the process of plastic injection molding includes: Feeding process: Exemplarily, a control valve (not shown in the figure) is arranged in the feeding tube 11. By controlling the opening and closing of the feeding tube 11 through the control valve, when the injection tube 42 needs to be replenished, the control valve is opened for feeding. During the injection process, the control valve is controlled to close the feeding tube 11. Among them, the control valve is electrically connected to the controller 6, so that the control of the control valve can be carried out through the controller 6. The plastic pellets in the material cylinder 1 are transported to the injection tube 42 through the feeding tube 11. Among them, driven by the motor 213, the transmission shaft 214 drives the screw 218 to rotate to transport the plastic pellets to the injection end of the injection tube 42. And under the action of the heating mechanism 4, the plastic transported to the injection end of the injection tube 42 is molten liquid. At this time, under the extrusion of the liquid plastic, there is a channel between the check ring 22 and the screw, and the liquid plastic can enter the injection end of the injection tube 42.

[0023] Pressure injection process: Stop the operation of the motor 213, and start the displacement driving member 211 to drive the displacement telescopic rod 212 to extend, so that the sliding seat 215 drives the motor 213 to move, and the transmission shaft 214 drives the screw rod 218 to move synchronously towards the direction close to the gate 316. At this time, under the reverse extrusion of the liquid plastic, the channel between the check ring 22 and the screw rod 218 is closed, so that the screw rod 218 can push the plastic at the injection end into the gate 316 and further push it into the molding cavity of the mold clamping mechanism 3.

[0024] It should be noted that the displacement driving member 211 can be a hydraulic telescopic cylinder, an electric telescopic cylinder, an electric telescopic cylinder, etc., which is not limited here.

[0025] Pressure holding process: The screw rod 218 remains stationary to keep the melt in the molding cavity still under pressure.

[0026] Reset process: The displacement driving member 211 drives the displacement telescopic rod 212 in the reverse direction to make the displacement telescopic rod 212 contract, so that the sliding seat 215 drives the motor 213 to move, and the transmission shaft 214 drives the screw rod 218 to move away from the gate 316. At the same time, the motor 213 drives the screw rod 218 to rotate through the transmission shaft 214 until the screw rod 218 is in the initial position. Among them, the rotation direction of the screw rod 218 during the reset process is opposite to the rotation direction of the screw rod 218 during the feeding process. Since the block 317 blocks the gate 316, that is, the outside air cannot enter the injection pipe 42. Compared with the traditional way of directly retracting the screw rod 218 without rotation, the way of the screw rod 218 rotating and moving at the same time can ensure that the screw rod 218 does not form a pumping effect on the plastic in the injection end of the injection pipe 42, that is, in the injection nozzle 421, so as to ensure that the plastic in the injection pipe 42 will not be pumped back. Therefore, after the screw rod 218 is reset to the initial position, the amount of molten plastic accommodated in the injection area at one end of the screw rod 218 facing the injection nozzle 421 will not decrease, which is sufficient for the next injection molding process, ensuring the accuracy and quality of the injection cycle.

[0027] It should be noted that the above-mentioned motor 213 and displacement driving member 211 are respectively electrically connected to the controller 6, that is, the operation of the motor 213 and displacement driving member 211 can be controlled by means of the controller 6.

[0028] Exemplarily, continue to refer to Figure 4 and Figure 5, the heating mechanism 4 includes a first heating element 411 and a second heating element 412. The first heating element 411 is arranged outside the injection tube 42, and the first heating element 411 is used to melt and heat the solid plastic raw material in the injection tube 42 into a liquid state. The second heating element 412 is arranged outside the injection nozzle 421, and the second heating element 412 is used to heat and keep the plastic in the injection nozzle 421 warm, so that the plastic in the injection nozzle 421 remains in a molten state and avoids cooling and solidification.

[0029] It should be noted that the above-mentioned first heating element 411 and second heating element 412 are respectively electrically connected to the controller 6, that is, the operation of the first heating element 411 and the second heating element 412 can be controlled by means of the controller 6.

[0030] It should be noted that as Figure 4 shown, the number of the first heating elements 411 is multiple, and the multiple first heating elements 411 are arranged in sequence along the axial line direction of the injection tube 42. And along the direction of the injection tube 42 close to the mold clamping mechanism 3, the heating temperature of the first heating element 411 for the plastic in the injection tube 42 gradually increases, so that the granular plastic raw material is gradually heated into a molten state, avoiding uneven partial melting of the plastic caused by rapid sudden heating, that is, avoiding the situation that due to partial melting and partial being granular, the air trapped in it cannot be discharged in time, forming bubbles and affecting the quality of the subsequent injection-molded products.

[0031] Exemplarily, continue to refer to Figure 4 、 Figure 5 and Figure 6 , the fixed mold 31 includes a housing 311 and a mounting block 312. A gate 316 is opened on one side of the housing 311 facing the injection tube 42. A mounting block 312 is fixedly installed on one side of the housing 311 facing the molding cavity. A material injection pipeline 313 and a communication pipeline 314 are respectively opened in the mounting block 312. The output end of the material injection pipeline 313 is communicated with the injection end of the molding cavity. The material injection pipeline 313 is communicated with the gate 316 through the communication pipeline 314, and the axial line of the material injection pipeline 313 is parallel and non-collinear with the axial line of the gate 316. Among them, the cross-sectional dimension value of the material injection pipeline 313, the cross-sectional dimension value of the communication pipeline 314, and the cross-sectional dimension value of the gate 316 increase in sequence. Among them, the plug 317 is slidably installed in the mounting block 312, the first spring 318 is fixedly connected to the mounting block 312, and the sliding direction of the plug 317 is the same as the axial line direction of the gate 316; As Figure 7As shown, on one side of the outer shell 311 facing the injection tube 42, there is an abutting groove 315 formed. The abutting groove 315 is circumferentially located outside the gate 316. An abutting inclined surface 422 is provided at the injection end of the injection nozzle 421, and the abutting inclined surface 422 is in abutting cooperation with the abutting groove 315.

[0032] In the above embodiment, through the abutting cooperation between the abutting inclined surface 422 of the injection nozzle 421 and the abutting groove 315, the injection cavity of the injection nozzle 421 is accurately docked with the gate 316 on the fixed mold 31, and multi-position injection is performed on the mold cavity through the injection pipelines 313 corresponding to the plurality of communicating pipelines 314, improving the injection efficiency. Moreover, the communicating pipelines 314 are arranged adjacent to the abutting inclined surface 422. By means of the second heating element 412 heating the injection nozzle 421, the side surface of the injection nozzle 421 conducts heat to the adjacent outer shell 311 and the mounting block 312, so that the plastic remaining in the communicating pipelines 314 is heated to remain in a molten state, while the plastic in the injection pipelines 313 is taken out together with the plastic part after the plastic part cools.

[0033] In another embodiment, based on the above embodiment, continue to refer to Figure 4 and Figure 5 , the injection mechanism 2 further includes a scraping component. The scraping component is arranged in the injection nozzle 421 and is used to gather the residual plastic raw material in the injection nozzle 421 into the injection tube 42.

[0034] It should be noted that since the radial dimension of the injection nozzle 421 is smaller than that of the injection tube 42, that is, within a unit length, the amount of molten plastic in the injection nozzle 421 is less than that in the injection tube 42. Therefore, in order to avoid excessive heating of the plastic in the injection nozzle 421, the heating temperature of the second heating element 412 for the injection nozzle 421 is controlled to be lower than the heating temperature of the first heating element 411 for the injection tube 42. Therefore, when no plastic is injected, a large amount of molten plastic remains in the injection nozzle 421 for a long time and is continuously heated at a temperature lower than that in the injection tube 42, which affects the fluidity of the plastic in the molten state. Therefore, with the help of the scraping component, the excessive residual molten plastic in the injection nozzle 421 during the reset process of the screw 218 is gathered into the injection tube 42, so that it receives a higher temperature and maintains its fluidity in the molten state, facilitating the smooth injection of the plastic when performing injection molding processing again.

[0035] Exemplarily, continue to refer to Figure 8 and Figure 9 , the scraping component includes a scraping driving part, a support ring 27 and a baffle 28. A plurality of baffles 28 are rotatably connected to the support ring 27, and the output end of the scraping driving part is in transmission connection with the baffle 28. Among them, there is a material passing gap between the support ring 27 and the inner wall of the injection nozzle 421; When the screw 218 pushes the liquid plastic raw material in the injection tube 42 to the gate 316, the support ring 27 is located at a position adjacent to one end of the injection nozzle 421 near the gate 316, and a plurality of the baffles 28 rotate to the unfolded position; when the screw 218 starts to move back, driven by the scraping driving member, the baffles 28 rotate to the closed position.

[0036] Exemplarily, continue to refer to Figure 8 、 Figure 9 and Figure 10 , the scraping driving member includes a diversion seat 24, a baffle 25, a traction rod 29, a second spring 210, a main magnet 291 and a sub-magnet 281. The diversion seat 24 is fixedly arranged in the injection nozzle 421. A slider 26 is slidably connected to the diversion seat 24 through a chute. The slider 26 is fixedly connected to the support ring 27. Among them, the diversion seat 24 is located below the support ring 27. A sub-magnet 281 is embedded at one end of the baffle 28 away from the support ring 27. A traction rod 29 is slidably connected in the screw cone part 23. A moving block 201 is fixedly connected to one end of the traction rod 29 located inside the screw cone part 23. A second spring 210 is sleeved on the side of the traction rod 29 between the moving block 201 and the screw cone part 23. A main magnet 291 is embedded at one end of the traction rod 29 located outside the screw cone part 23. Among them, the baffle 25 is fixedly arranged in the injection nozzle 421, and the baffle 25 is located at a position between the support ring 27 and the screw cone part 23; When the screw 218 performs pressurized injection and drives the traction rod 29 to move towards the gate 316, the baffle 28 is located at a position adjacent to one end of the diversion seat 24 near the gate 316, and the baffle 28 rotates and unfolds under the extrusion of the molten plastic; when the screw 218 starts to move back, at this time, the molten plastic in the injection nozzle 421 is no longer under the extrusion force of the screw 218, so that under the magnetic attraction of the main magnet 291 on the traction rod 29 to the sub-magnet 281 on the baffle 28, the baffle 28 rotates to the closed position, as shown in Figure 9 . And with the reset movement of the traction rod 29 following the screw 218, the baffle 28 drives the support ring 27 to move towards the injection tube 42 until the support ring 27 abuts against the baffle 25, thereby pushing the residual molten plastic in the injection nozzle 421 into the injection tube 42 by means of the baffle 28. And under the action of gravity, only the plastic in the upper area of the injection nozzle 421 is scraped off and dropped into the lower diversion seat 24, and then flows into the injection tube 42 to be heated at a higher temperature to maintain its fluidity in the molten state. Under the abutment of the baffle 25, the baffle 28 is disengaged from the abutment with the traction rod 29.

[0037] It should be noted that, as shown in Figure 8As shown, there is a material passing gap between the support ring 27 and the inner wall of the injection nozzle 421, that is, the position of the radial cutting end face of the injection nozzle 421 indicated by the dotted line. When the support ring 27 drives a plurality of baffles 28 to move towards the screw 218, the molten plastic being pushed is diffused to the side of the baffle 28 away from the screw 218 through the material passing gap between the support ring 27 and the inner wall of the injection nozzle 421, so that the upper wall of the injection cavity of the injection nozzle 421 after the baffle 28 is gathered is covered with a part of the molten plastic to receive the heating of the second heating element 412, avoiding the situation that the inner wall of the injection nozzle 421 has exposed blank areas, resulting in the second heating element 412 heating the injection nozzle 421 in vain, and saving energy.

[0038] As Figure 9 shown, along the axial line direction of the injection nozzle 421 and in the direction from the injection pipe 42 to the gate 316, the wall thickness of the flow guiding seat 24 gradually increases, and the inner wall of the flow guiding seat 24 is inclined, which is convenient for the molten plastic intercepted by the baffle 28 to fall onto the flow guiding seat 24 and flow into the injection pipe 42.

[0039] It should be noted that when the molding device with a rapid prototyping mechanism for producing environmental protection plastics is in use, granular plastic raw materials are conveyed into the injection pipe 42 through the feed hopper 11 by the barrel 1. Driven by the motor 213, the screw 218 rotates to convey the plastic into the material cavity of the injection pipe 42, and under the heating of a plurality of first heating elements 411, the plastic conveyed into the material cavity of the injection pipe 42 becomes molten; Then, the displacement driving member 211 is started, the transmission slide 215 drives the motor 213 to move, so that the transmission shaft 214 drives the screw 218 to move synchronously towards the injection nozzle 421, thereby extruding and pushing the molten plastic in the injection pipe 42 into the injection nozzle 421. At this time, under the extrusion of the molten plastic, the plug 317 extrudes the first spring 318 to open the gate 316, and the gate 316 is communicated with the connecting pipe 314. Moreover, under the extrusion of the molten plastic, a plurality of baffles 28 also rotate to the open position, so that the molten plastic sequentially passes through the gate 316, the connecting pipe 314 and the injection pipe 313 and enters the molding cavity of the mold clamping mechanism 3. Among them, the molding cavity is located between the fixed mold 31 and the moving mold. At this time, the screw 218 stops moving, and the molten plastic is kept under pressure, so that the plastic product is cooled and molded in the mold clamping mechanism 3; After the injection is completed and before the product is taken out, the displacement telescopic rod 212 is driven by the displacement driving member 211, so that the sliding seat 215 drives the motor 213 to move away from the injection tube 42. And under the drive of the motor 213, the screw rod 218 moves and rotates while resetting to return to the initial position. When the screw rod 218 starts to reset and move, since the extrusion force of the molten plastic at the injection end in the injection tube 42 by the screw rod 218 is released, the blocking block 317 moves towards the screw rod 218 under the elastic force of the first spring 318 to block the gate 316, so that during the subsequent process of taking out the product, the gate 316 is isolated from the outside air, avoiding the oxidation of the plastic in the injection nozzle 421 when it contacts the air for a long time and affecting the quality of the plastic product; And when the screw rod 218 starts to reset and move, since the extrusion force of the molten plastic at the injection end in the injection tube 42 by the screw rod 218 is released, the baffle 28 is under the magnetic attraction force of the main magnet block 291 and the sub-magnet block 281. During the continuous reset and movement of the screw rod 218, the baffle 28 is under the traction of the traction rod 29, and the support ring 27 drives the baffle 28 to move towards the screw rod 218, so as to gather the excessive residual molten plastic in the injection nozzle 421 to the injection tube 42 by means of the baffle 28, making it receive a higher temperature and maintaining its fluidity in the molten state, which is convenient for the smooth injection of plastic during the next injection molding process; In addition, since there is a material passing gap between the support ring 27 and the inner wall of the injection nozzle 421, when the support ring 27 drives the baffle 28 to push the material, the extruded molten plastic overflows to the side of the baffle 28 away from the screw rod 218 through the material passing gap between the support ring 27 and the inner wall of the injection nozzle 421, so that the upper wall of the injection cavity of the injection nozzle 421 after the baffle 28 gathers is covered with part of the molten plastic to receive the heating of the second heating member 412, avoiding the situation that the inner wall of the injection nozzle 421 has an exposed blank area, resulting in the second heating member 412 heating the injection nozzle 421 in vain and saving energy; When the support ring 27 moves to abut against the baffle 25, under the block of the baffle 25, the baffle 28 is disengaged from the traction constraint of the traction rod 29, and when the screw rod 218 extrudes and pushes the molten plastic for injection next time, the support ring 27 moves with the baffle 28 to the end position away from the screw rod 218; Start the displacement driving member 211 again to make the screw rod 218 repeat the above actions and perform the injection molding preparation steps of the plastic product.

[0040] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention.

Claims

1. A molding device with a rapid molding mechanism for producing environmentally friendly plastics, comprising a feeding mechanism, an injection mechanism (2) and a mold clamping mechanism (3), and a heating mechanism (4) arranged outside an injection tube (42) in the injection mechanism (2), the heating mechanism (4) being used to melt and heat the plastic raw material in the injection tube (42), the injection mechanism (2) being used to inject the molten plastic raw material into a molding cavity in the mold clamping mechanism (3), characterized in that: The injection mechanism (2) further comprises an injection assembly, a blocking block (317) and an injection nozzle (421), wherein the injection assembly is arranged in an injection tube (42), and an injection nozzle (421) is fixedly connected to one end of the injection tube (42) adjacent to the mold clamping mechanism (3), and an injection cavity provided in the injection nozzle (421) is communicated with a material cavity of the injection tube (42), wherein the mold clamping mechanism (3) comprises a fixed mold (31), and a gate (316) is provided at the injection end of the mold cavity of the fixed mold (31), and the gate (316) is communicated with the injection end of the molding mold cavity, and the injection assembly is used to push the molten plastic raw material into the gate (316) through the injection nozzle (421), and the blocking block (317) is slidably arranged in the fixed mold (31), and an end of the blocking block (317) away from the injection nozzle (421) is fixedly connected to a first spring (318), and the first spring (318) is fixedly connected to the fixed mold (31); When the injection assembly pushes the liquid plastic raw material in the injection tube (42) to the gate (316), the block (317) is located at the open position under the hydraulic pressure of the liquid plastic raw material, and the injection nozzle (421) is connected to the gate (316); when the injection assembly replenishes the injection area in the injection tube (42), the block (317) is located at the initial position, and the gate (316) is not connected to the injection nozzle (421).

2. A molding device with a rapid molding mechanism for producing environmentally friendly plastics according to claim 1, characterized in that: The injection assembly comprises a driving assembly, a screw (218), and a check ring (22); the output end of the driving assembly is connected to the input end of the screw (218); the screw (218) passes through the injection tube (42) and is slidably connected to the injection tube (42); one end of the screw (218) located in the injection tube (42) is fixedly connected to a screw cone (23); a position of the screw (218) adjacent to the screw cone (23) is sleeved with a check ring (22); the check ring (22) is slidably connected to the injection tube (42); the transmission assembly in the driving assembly is used to drive the screw (218) to rotate; and the reciprocating assembly in the driving assembly is used to drive the screw (218) to reciprocate; The material discharge mechanism comprises a material barrel (1), and the material barrel (1) is connected to an injection tube (42) via a material discharge tube (11).

3. A molding device with a rapid molding mechanism for producing environmentally friendly plastics according to claim 2, characterized in that: The transmission assembly comprises a motor (213) and a transmission shaft (214); the output end of the motor (213) is fixedly connected to the transmission shaft (214); the output end of the transmission shaft (214) is transmission-connected to a screw rod (218); the reciprocating assembly comprises a shift drive member (211), a shift telescopic rod (212), a slide seat (215) and a slide rail (216); the motor (213) is fixedly arranged on the slide seat (215); the slide seat (215) is slidably connected to the slide rail (216); and the slide rail (216) is fixedly arranged on a workbench (5) via a base (217).

4. A molding device with a rapid molding mechanism for producing environmentally friendly plastics according to claim 2 or 3, characterized in that: The heating mechanism (4) comprises a first heating element (411) and a second heating element (412); the first heating element (411) is arranged outside the injection tube (42); the first heating element (411) is used to melt and heat the solid plastic raw material in the injection tube (42) into a liquid state; the second heating element (412) is arranged outside the injection nozzle (421); the second heating element (412) is used to heat and keep the plastic in the injection nozzle (421) warm.

5. A molding device with a rapid molding mechanism for producing environmentally friendly plastics according to claim 4, characterized in that: There are a plurality of first heating elements (411), and the plurality of first heating elements (411) are arranged in sequence along the axial direction of the injection tube (42), and along the direction of the injection tube (42) approaching the mold clamping mechanism (3), the heating temperature of the plastic in the injection tube (42) by the first heating elements (411) gradually increases.

6. A molding device with a rapid molding mechanism for producing environmentally friendly plastics according to claim 5, characterized in that: The fixed mold (31) comprises a shell (311) and a mounting block (312); a gate (316) is provided on a side of the shell (311) facing the injection tube (42); a mounting block (312) is fixedly mounted on a side of the shell (311) facing the molding cavity; an injection pipe (313) and a connecting pipe (314) are respectively provided in the mounting block (312); an output end of the injection pipe (313) is connected to an injection end of the molding cavity; and the injection pipe (313) is connected to the gate (316) via the connecting pipe (314). 316), and the axis of the injection pipe (313) is parallel to the axis of the gate (316) and is not arranged in a colinear manner, wherein the cross-sectional dimensions of the injection pipe (313), the cross-sectional dimensions of the connecting pipe (314) and the gate (316) increase in sequence, wherein the blocking block (317) is slidably mounted in the mounting block (312), the first spring (318) is fixedly connected to the mounting block (312), and the sliding direction of the blocking block (317) is consistent with the axis direction of the gate (316); The shell (311) is provided with an abutment groove (315) on one side facing the injection tube (42), the abutment groove (315) being circumferentially located outside the gate (316), and the injection end of the injection nozzle (421) is provided with an abutment slope (422), the abutment slope (422) being in abutment with the abutment groove (315).

7. A molding device with a rapid molding mechanism for producing environmentally friendly plastics according to claim 6, characterized in that: The injection mechanism (2) further comprises a scraper assembly, which is arranged in the injection nozzle (421) and is used to collect the plastic raw material remaining in the injection nozzle (421) into the injection tube (42).

8. A molding device with a rapid molding mechanism for producing environmentally friendly plastics according to claim 7, characterized in that: The scraper assembly comprises a scraper drive, a support ring (27) and baffles (28), wherein a plurality of baffles (28) are rotatably connected to the support ring (27), and an output end of the scraper drive is transmission-connected to the baffles (28), wherein a material passing gap is provided between the support ring (27) and the inner wall of the injection nozzle (421); When the screw (218) pushes the liquid plastic raw material in the injection tube (42) to the gate (316), the support ring (27) is located in the injection nozzle (421) at a position adjacent to one end of the gate (316), and the plurality of baffles (28) rotate to an extended position; when the screw (218) starts to return to its original position, the baffles (28) rotate to a closed position under the drive of the scraper drive.

9. A molding device with a rapid molding mechanism for producing environmentally friendly plastics according to claim 8, characterized in that: The scraper drive component comprises a guide seat (24), a baffle (25), a traction rod (29), a second spring (210), a main magnetic block (291) and an auxiliary magnetic block (281); the guide seat (24) is fixedly arranged in the injection nozzle (421); a slider (26) is slidably connected to the guide seat (24) via a slide groove; the slider (26) is fixedly connected to the support ring (27); wherein the guide seat (24) is located below the support ring (27); an auxiliary magnetic block (281) is embedded at one end of the baffle (28) away from the support ring (27); A traction rod (29) is slidably connected inside the rod cone (23); one end of the traction rod (29) located inside the screw cone (23) is fixedly connected to a shift block (201); a second spring (210) is sleeved on the side of the traction rod (29) between the shift block (201) and the screw cone (23); and a main magnetic block (291) is embedded in one end of the traction rod (29) located outside the screw cone (23); wherein a baffle (25) is fixedly arranged in the injection nozzle (421); and the baffle (25) is located between the support ring (27) and the screw cone (23); When the screw rod (218) starts to reset, the main magnetic block (291) and the auxiliary magnetic block (281) are magnetically attracted to abut against each other, the baffle (28) rotates to a closed position, and the baffle (28) drives the support ring (27) to move in a direction close to the injection tube (42) until the support ring (27) abuts against the baffle (25).

10. A molding device with a rapid molding mechanism for producing environmentally friendly plastics according to claim 9, characterized in that: Along the axial direction of the injection nozzle (421) and in the direction from the injection tube (42) to the gate (316), the wall thickness of the flow guide seat (24) gradually increases, and the inner wall of the flow guide seat (24) is arranged to be inclined.

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