Injection molding device for plastic pipe

Abstract

The invention discloses an injection molding device for plastic pipes, and relates to the technical field of injection molding, the injection molding device comprises a machine base, an injection assembly and a feeding assembly, a mold closing assembly is arranged on the upper end face of the machine base, the injection assembly comprises a molten material barrel and a material pushing screw rod, the molten material barrel is installed on the machine base, and an injection port is formed in one end of the molten material barrel; the feeding assembly comprises a feeding pipeline, the feeding pipeline is communicated with the melting material barrel, a feeding port is formed in the feeding pipeline, a feeding screw rod is arranged in the feeding pipeline, a driving part for driving the feeding screw rod to rotate is arranged on the feeding pipeline, and the driving part is connected with the feeding screw rod. The lower end of the feeding screw rod is connected with a filter screen disc which is arranged in an inclined mode. The device has the effects that caked plastic particles can be avoided as much as possible, so that complete melting of the plastic particles is guaranteed as much as possible, stable operation of the device is guaranteed as much as possible, and the production quality of products is improved as much as possible.

Description

Technical Field

[0001] The present application relates to the technical field of injection molding, and in particular to an injection molding device for plastic pipes. Background Art

[0002] The molding methods of plastic pipes mainly include extrusion molding and injection molding. Extrusion molding is one of the most commonly used methods in the production of plastic pipes, while injection molding is mainly used to produce plastic products with more complex shapes such as PP pipe fittings.

[0003] The injection molding device used for injection molding mainly includes a machine base, a melting barrel is arranged on the machine base, a pushing screw is arranged inside the melting barrel, one end of the pushing screw extends to the outside of the melting barrel, a driving component for driving the pushing screw to rotate is arranged on the machine base, a heating component is arranged on the melting barrel, one end of the melting barrel away from the driving component is arranged as an injection port, a clamping component connected with the injection port is arranged on the machine base, and a feeding component is also arranged on the melting barrel. The feeding component sends plastic particles into the melting barrel for melting, and the screw extrude the molten plastic to the injection port. The molten plastic enters the clamping component from the injection port. After the molten plastic is cooled, a molded plastic product can be obtained.

[0004] However, in the above technology, since plastic particles are easy to agglomerate, when the agglomerated plastic particles enter the melting barrel through the feeding component, the plastic particles in the center of the agglomerate may not be completely melted, and are pushed to the injection port or the clamping component by the pushing screw, which may easily lead to blockage of the injection port or a decrease in product quality. Summary of the invention

[0005] The purpose of the present application is to provide an injection molding device for plastic pipes, which can avoid the generation of agglomerated plastic particles as much as possible, thereby ensuring the complete melting of the plastic particles as much as possible, and further ensuring the stable operation of the device and improving the production quality of the product as much as possible.

[0006] The present application provides a plastic pipe injection molding device that adopts the following technical solution: A machine base, the upper end surface of which is provided with a clamping assembly for molding molten plastic; An injection assembly, comprising a melt barrel and a push screw, wherein the melt barrel is mounted on the machine base, an injection port is provided at one end of the melt barrel, the injection port is communicated with the mold clamping assembly, the push screw is located in the melt barrel, an end of the push screw away from the injection port extends out of the melt barrel, and is connected to a drive assembly; The feeding component includes a feed pipe, which is connected to the melting barrel and has a feed port. A feeding screw is coaxially arranged in the feed pipe, and a driving member for driving the feeding screw to rotate is provided on the feed pipe. Plastic particles cannot pass through the gap between the side of the feeding screw and the feed pipe. A filter screen is connected to the lower end of the feeding screw. There is a certain angle between the axis of the filter screen and the axis of the feeding screw. Plastic particles cannot pass through the gap between the side of the filter screen and the feed pipe. Plastic lumps falling on the filter screen will be bounced up and collide with the inner wall of the feed pipe until they are broken.

[0007] Optionally, an air inlet pipe is provided on the feed pipe, an air guide channel is opened in the peripheral wall of the feed pipe, a plurality of air outlets are opened on the inner peripheral wall of the feed pipe, and one end of the air inlet pipe away from the feed pipe is connected to a hot air source, and the hot air ejected from the air outlet can dry the plastic particles in the feed pipe.

[0008] Optionally, the plurality of air outlets are evenly spaced around the axis of the feed pipe, and the plurality of air outlets are inclined in a direction close to a vertical upward direction. The gas ejected from the air outlets can blow the plastic particles or plastic agglomerates into the air to increase the contact area between the plastic particles or plastic agglomerates and the air, thereby facilitating the drying process.

[0009] Optionally, the air intake pipe is provided with an adjusting member for adjusting the gas flow speed in the air intake pipe, and the feed pipe is provided with a detection member for detecting whether there are plastic agglomerates on the filter mesh disk. When the detection member detects the presence of plastic agglomerates on the filter mesh disk, the adjusting member increases the gas flow speed in the air intake pipe to speed up the drying speed of the plastic agglomerates and enhance the degree of collision of the plastic agglomerates. When the detection member detects that there are no plastic agglomerates on the filter mesh disk, the adjusting member reduces the gas flow speed in the air intake pipe.

[0010] Optionally, the adjusting member includes a mounting frame, a fan and a rotating motor, the mounting frame is coaxially mounted on the inner circumferential wall of the air intake duct, the fan is rotatably mounted on the mounting frame, the rotating motor is mounted on the mounting frame, and the output shaft of the rotating motor is coaxially fixedly connected to the fan, the detecting member is an ultrasonic sensor, and the ultrasonic sensor and the rotating motor are both electrically connected to the control center.

[0011] Optionally, a feed funnel is provided on the upper end surface of the feed pipe, the feed funnel is set to be closed, and the feed port is set on the feed funnel.

[0012] Optionally, the driving member includes a bracket and a driving motor, the bracket is mounted on the feed hopper, the driving motor is mounted on the bracket, and the upper end surface of the feeding screw extends to the outside of the feed funnel and is coaxially fixedly connected to the output shaft of the driving motor.

[0013] Optionally, an exhaust port is provided at the upper end of the feed funnel, and a breathable film is provided at the exhaust port.

[0014] Optionally, a crushing assembly is provided in the feed hopper, and the crushing assembly is used to preliminarily crush plastic agglomerates.

[0015] Optionally, the crushing assembly includes two groups of crushing rollers, which are arranged opposite to each other, with two crushing rollers in each group. The two crushing rollers are rotatably mounted on the inner wall of the feed funnel, with a certain gap between the two crushing rollers, and the extension portion of the feeding screw is coaxially fixedly connected with a first gear, and the two crushing rollers in each group are coaxially fixedly connected with a second gear and a third gear at one end close to the first gear, respectively, the first gear is meshed with the second gear, and the second gear is meshed with the third gear.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. The setting of the feeding screw can make the plastic particles in the feed pipe enter the inside of the melting barrel in a quantitative manner within a unit time, so as to avoid too much plastic entering the melting barrel within a unit time, resulting in the plastic particles in the melting barrel not being completely melted, thereby avoiding the blockage of the injection port due to the unmelted plastic particles, or the unmelted plastic particles entering the mold clamping component, which improves the stability of the equipment during operation and the production quality of the product as a whole; in addition, the setting of the filter screen can filter out the agglomerated plastic particles in the feed pipe, so as to avoid the agglomerated plastic particles entering the melting barrel as much as possible. The filter screen can be used to filter the plastic material in the melt barrel, thereby further improving the stability of the equipment during operation and the production quality of the product; at the same time, the filter screen rotates with the feeding screw and is arranged along an inclination, so that the filter screen will exert a lateral thrust and an upward thrust on the agglomerates during rotation, so that the agglomerates hit the inner wall of the feed pipe or the feeding screw, so that the agglomerates are impacted and broken, so that the filter screen can not only screen the agglomerates, but also break the agglomerates, so that the broken plastic agglomerates enter the melt barrel along the filter screen, which avoids the generation of agglomerates as a whole, thereby further improving the stability of the equipment during operation and the production quality of the product; 2. The air inlet pipe, air guide channel and air blowing port are arranged to dry the plastic particles in the feed pipe. On the one hand, it can avoid the moisture in the plastic particles from forming bubbles after being heated and entering the mold assembly, causing the product to be hollow or collapsed. On the other hand, since wet plastic particles are also easy to stick to each other, drying the plastic particles can avoid the probability of plastic particles agglomerating as much as possible, thereby further improving the stability of the equipment during operation and the production quality of the product. In addition, after drying the agglomerated plastic particles on the filter screen, the agglomerated plastic particles will become more brittle due to the loss of moisture. Therefore, when the filter screen applies thrust to the agglomerated plastic particles, the agglomerated plastic particles are easier to break. Similarly, when the agglomerated plastic particles hit the inner wall of the feed pipe or the feeding screw, they are also easy to break, thereby further reducing the generation of agglomerated plastic particles in the feed pipe and further improving the stability of the equipment during operation and the production quality of the product. 3. When the filter screen is in a rotating state, some plastic particles and plastic agglomerates will be subjected to the lateral thrust and vertical upward thrust of the filter screen when they fall onto the surface of the filter screen. Therefore, some plastic particles and plastic agglomerates will be pushed into the air by the filter screen. The contact area between the plastic particles and plastic agglomerates in the air is larger. Therefore, the hot air ejected from the air outlet has a better drying effect on the plastic particles and plastic agglomerates. At the same time, the air outlet is arranged along an upward tilt, which can make the plastic particles and plastic agglomerates stay in the air for a longer time, further improving the drying effect of the hot air on the plastic particles and plastic agglomerates. 4. The air inlet duct is provided with a regulating device for adjusting the wind speed inside the duct. When the wind speed increases, not only the drying effect on the plastic agglomerates is improved, but the gas ejected from the air outlet can also exert thrust on the plastic agglomerates, thereby enhancing the strength of the plastic agglomerates impacting the inside of the feed duct, and increasing the probability of the plastic agglomerates breaking, thereby further reducing the generation of agglomerated plastic particles in the feed duct, and further improving the stability of the equipment during operation and the production quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 It is a schematic diagram of the structure of the feeding screw in the embodiment of the present application; Figure 3 is a schematic cross-sectional structural diagram of an embodiment of the present application; Figure 4 is a schematic cross-sectional structural diagram of a feeding assembly in an embodiment of the present application; Figure 5 yes Figure 4 The enlarged schematic diagram of point A in the middle; Figure 6 yes Figure 4 The enlarged schematic diagram of point B in the middle; In the figure, 1, machine base; 2, mold clamping assembly; 21, upper mold clamping; 22, lower mold clamping; 3, injection assembly; 31, support; 32, melting barrel; 321, injection port; 33, push screw; 34, drive assembly; 4, loading assembly; 41, feed pipe; 411, air intake pipe; 412, air guide channel; 413, air outlet; 42, feed funnel; 421, feed port; 422, exhaust port; 43, feed screw; 44, filter screen; 45, adjustment member; 451, mounting bracket; 452, fan; 453, rotating motor; 46, detection member; 47, drive member; 471, bracket; 472, drive motor; 5, crushing assembly; 51, crushing roller; 52, first gear; 53, second gear; 54, third gear. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-6 , further details of this application are given.

[0019] An injection molding device for plastic pipes, referring to Figure 1 and Figure 2 , including a machine base 1, a mold clamping component 2, an injection component 3, and a feeding component 4.

[0020] The clamping assembly 2 in this embodiment includes an upper clamping mold 21 and a lower clamping mold 22, both of which are installed on the upper end surface of the machine base 1. The clamping assembly 2 also includes a driving device (not shown in the figure) for driving the lower clamping mold 22 to move close to the upper clamping mold 21, and a cooling device (not shown in the figure) for cooling the upper clamping mold 21 and the lower clamping mold 22. The clamping assembly 2 is a prior art and will not be described in detail here.

[0021] The injection assembly 3 includes a molten material barrel 32 and a push screw 33. A support 31 is fixedly installed on the upper end surface of the machine base 1. The molten material barrel 32 is fixedly installed on the support 31 in the horizontal direction. An injection port 321 is provided at one end of the molten material barrel 32 close to the upper mold 21. The injection port 321 is connected to the mold cavity of the upper mold 21. The push screw 33 is coaxially located in the molten material barrel 32. The end of the push screw 33 away from the injection port 321 extends out of the molten material barrel 32. A driving assembly 34 is provided on the machine base 1. The driving assembly 34 in this embodiment is configured as a stepping motor. The output shaft of the stepping motor is coaxially fixedly connected to the end of the screw away from the upper mold 21. A heating assembly is provided on the outer peripheral wall of the molten material barrel 32. The heating assembly is used to heat the plastic particles in the molten material barrel 32. The heating assembly in this embodiment is a prior art and will not be described in detail herein.

[0022] Reference Figure 1 , Figure 2 and Figure 3 The feeding assembly 4 includes a feeding pipe 41 and a feeding funnel 42 .

[0023] The feed pipe 41 is arranged in the vertical direction and is connected with the melting barrel 32. The feed funnel 42 in this embodiment is configured to be closed. The lower end of the feed funnel 42 is coaxially connected with the upper end of the feed pipe 41. A feed port 421 is provided on the upper end surface of the feed funnel 42. The closed setting of the feed funnel 42 in this embodiment can isolate the plastic particles in the feed funnel 42 from contact with moist air to a certain extent, thereby avoiding the agglomeration of the plastic particles.

[0024] A feeding screw 43 is coaxially arranged in the feed pipe 41, and plastic particles cannot pass through the gap between the side of the feeding screw 43 and the feed pipe 41. A filter screen 44 is coaxially fixedly connected to the lower end of the feeding screw 43. There is a certain angle between the axis of the filter screen 44 and the axis of the feeding screw 43, that is, the filter screen 44 is arranged obliquely, and plastic particles cannot pass through the gap between the side of the filter screen 44 and the inner wall of the feed pipe 41. The upper end of the feeding screw 43 passes through the upper end face of the feed hopper 42 and extends to the outside of the feed funnel 42. The feeding screw 43 is rotatably connected to the upper end face of the feed funnel 42. A crushing component 5 for preliminarily crushing the agglomerated plastic is provided on the extended part of the feeding screw 43. The crushing component 5 is located in the feed funnel 42, and the upper end face of the feed funnel 42 is provided with a driving member 47 for driving the feeding screw 43 to rotate.

[0025] Before loading, the heating component on the melt barrel 32 is started to heat the melt barrel 32, and then the driving component 47 and the stepper motor are started. The driving component 47 drives the feeding screw 43 to rotate, and the crushing component 5 is started at the same time. When the plastic particles are poured into the feeding funnel 42 from the feeding port 421, if there are plastic agglomerates in the feeding funnel 42, the crushing component 5 in this embodiment will perform a preliminary crushing of the plastic agglomerates in the feeding funnel 42, and then the plastic particles in the feeding funnel 42 are sent to the filter screen 44 by the feeding screw 43. The filter screen 44 in this embodiment can allow plastic particles of normal size to pass through. Therefore, when the plastic particles of normal size fall into the filter, When the filter screen 44 is on the mesh plate 44, plastic particles of normal size will directly pass through the filter screen plate 44 and enter the melting barrel 32, while the plastic agglomerates are relatively large in size, so they fall to the upper end surface of the filter screen plate 44 and cannot pass through the filter screen plate 44. At the same time, since the filter screen plate 44 rotates with the feed screw 43 and is arranged along an incline, the filter screen plate 44 will apply lateral and upward thrusts to the agglomerates during rotation, causing the agglomerates to collide with the inner wall of the feed pipe 41 or the feed screw 43. After the collision, the agglomerates will be broken into smaller particles, and then the broken particles will pass through the filter screen plate 44 and fall into the melting barrel 32.

[0026] The filter mesh disk 44 in this embodiment can not only screen plastic agglomerates, but also crush the plastic agglomerates so that the crushed plastic agglomerates enter the melting barrel 32 along the filter mesh disk 44. It can avoid the plastic agglomerates from entering the melting barrel 32 as a whole, thereby preventing the unmelted plastic agglomerates in the melting barrel 32 from blocking the injection port 321, or the unmelted plastic agglomerates from entering the mold cavity in the clamping assembly 2, resulting in a decrease in product quality. Therefore, the filter mesh disk 44 improves the stability of the equipment during operation and the production quality of the product as a whole.

[0027] It should be noted that the setting of the feeding screw 43 in the present embodiment can not only feed the plastic particles in the feeding funnel 42 into the melting barrel 32, but also enable the plastic particles in the feeding funnel 42 to enter the melting barrel 32 in a quantitative manner within a unit time. Therefore, there will not be too many plastic particles per unit area on the filter mesh disk 44, and therefore there will not be a situation where the rotating filter mesh disk 44 cannot bounce off the plastic agglomerates due to excessive plastic particles on the filter mesh disk 44. At the same time, when the filter mesh disk 44 bounces off the plastic agglomerates, the bounced-off plastic agglomerates may mix with the plastic particles falling from the feeding screw 43. Or plastic agglomerates collide, thereby further improving the efficiency of plastic agglomerate crushing; at the same time, compared with the prior art, the feeding screw 43 can make the plastic particles in the feed funnel 42 enter the melting barrel 32 in a quantitative manner per unit time, thereby avoiding as much as possible that too much plastic enters the melting barrel 32 per unit time, resulting in the plastic particles in the melting barrel 32 not being completely melted, thereby avoiding the unmelted plastic particles causing the injection port 321 to be blocked, or the unmelted plastic particles entering the clamping assembly 2, which further improves the stability of the equipment during operation and improves the production quality of the product as a whole.

[0028] Among them, refer to Figure 4 The crushing assembly 5 in this embodiment includes two sets of crushing rollers 51 (combined Figure 6 ).

[0029] Two groups of crushing rollers 51 are arranged horizontally on both sides of the feeding screw 43, and each group is provided with two crushing rollers 51. The two crushing rollers 51 are arranged horizontally and are rotatably installed on the inner wall of the feeding funnel 42. A certain gap is left between the two crushing rollers 51. The extension part of the feeding screw 43 is coaxially fixedly connected with the first gear 52. The ends of the two crushing rollers 51 in each group close to the first gear 52 are coaxially fixedly connected with the second gear 53 and the third gear 54 respectively. The first gear 52 is meshed with the second gear 53, and the second gear 53 is meshed with the third gear 54.

[0030] When the driving member 47 drives the feeding screw 43 to rotate, the feeding screw 43 will drive the first gear 52 to rotate, the first gear 52 will drive the second gear 53 to rotate, and the rotation of the second gear 53 will drive the third gear 54 to rotate. Since the second gear 53 and the third gear 54 are meshed, the second gear 53 and the third gear 54 rotate in opposite directions. Since the second gear 53 and the third gear 54 are coaxially fixedly connected to the two crushing rollers 51 respectively, the two crushing rollers 51 in each group will also rotate in opposite directions. Therefore, the two crushing rollers 51 in each group will pull the plastic agglomerates in the feeding funnel 42 to between the two crushing rollers 51. Since the distance between the two crushing rollers 51 is constant, the outer peripheral walls of the two crushing rollers 51 will squeeze the plastic agglomerates, thereby crushing the plastic agglomerates.

[0031] Reference Figure 4 and Figure 5 In this embodiment, an air intake pipe 411 is arranged on the outer peripheral wall of the feed pipe 41, an air guide channel 412 is opened in the peripheral wall of the feed pipe 41, and a plurality of air outlets 413 are opened on the inner peripheral wall of the feed pipe 41. In this embodiment, six air outlets 413 are arranged, and the six air outlets 413 are all connected with the air guide channel 412. The six air outlets 413 are located on a horizontal plane and between the feeding screw 43 and the filter mesh plate 44. The six air outlets 413 are all arranged obliquely in a direction close to the vertical upward direction. The air intake pipe 411 in this embodiment is connected with a hot air source (not shown in the figure) at one end away from the feed pipe 41.

[0032] When the hot air source is started, the hot air is ejected from the six air outlets 413 through the air inlet pipe 411 and the air guide channel 412. The ejected hot air can dry the plastic particles in the feed pipe 41. On the one hand, it can avoid the moisture in the plastic particles from forming bubbles after being heated and entering the mold assembly 2, causing the product to become hollow or collapsed. On the other hand, since wet plastic particles are also easy to stick to each other, drying the plastic particles can avoid the probability of plastic particles agglomerating as much as possible, thereby further improving the stability and The production quality of the product is improved. In addition, after the plastic particles that have already agglomerated on the filter mesh plate 44 are dried, the agglomerated plastic particles will become more brittle due to the loss of moisture. Therefore, when the filter mesh plate 44 applies thrust to the agglomerated plastic particles, the agglomerated plastic particles are easier to break. Similarly, when the agglomerated plastic particles hit the inner wall of the feed pipe 41 or the feed screw 43, the agglomerated plastic particles are also easy to break, thereby further reducing the generation of agglomerated plastic particles in the feed pipe 41 and further improving the stability of the equipment during operation and the production quality of the product.

[0033] It should be noted that when the filter mesh disk 44 is in a rotating state, some plastic particles and plastic agglomerates will be subjected to the lateral thrust and vertical thrust of the filter mesh disk 44 when falling to the surface of the filter mesh disk 44. Therefore, some plastic particles and plastic agglomerates will be pushed into the air by the filter mesh disk 44, and the contact area between the part of the plastic particles and plastic agglomerates in the air and the air is larger. Therefore, the hot air ejected from the air outlet 413 has a better drying effect on the plastic particles and plastic agglomerates; at the same time, the air outlet 413 is arranged along an upward inclination, which can make the plastic particles and plastic agglomerates stay in the air for a longer time, further improving the drying effect of the hot air on the plastic particles and plastic agglomerates.

[0034] The air intake pipe 411 is provided with an adjusting member 45 for adjusting the gas flow velocity in the air intake pipe 411 , and the feed pipe 41 is provided with a detecting member 46 for detecting whether there is plastic agglomeration on the filter screen plate 44 .

[0035] When the detection component 46 detects the presence of plastic agglomerates on the filter mesh plate 44, the adjustment component 45 increases the gas flow rate in the air inlet pipe 411, thereby increasing the wind force of the hot air ejected from the air outlet 413. The increase in the hot air wind force can not only speed up the drying speed of the plastic agglomerates, but also exert thrust on the plastic agglomerates, so that the plastic agglomerates have greater momentum, thereby increasing the degree of impact when the plastic agglomerates contact the inside of the feed pipe 41 or the feeding screw 43, thereby increasing the probability and effect of breaking the plastic agglomerates; and when the detection component 46 detects that there are no plastic agglomerates on the filter mesh plate 44, the adjustment component 45 reduces the gas flow rate in the air inlet pipe 411, thereby avoiding excessive use of hot air as much as possible, resulting in waste of hot air.

[0036] In order to avoid the increase of air pressure in the feed pipe 41 and the feed funnel 42 as much as possible, an exhaust port 422 is provided on the upper end surface of the feed funnel 42, and a breathable film (not shown in the figure) is provided at the exhaust port 422. The setting of the exhaust port 422 can make the feed funnel 42 and the feed pipe 41 maintain a balance with the external air pressure, thereby ensuring the stable operation of the equipment as much as possible; in addition, when the hot air dries the plastic particles, the hot air will dry and evaporate the moisture in the plastic particles. After evaporation, the water vapor will float in a vertical upward direction. The setting of the exhaust port 422 can also discharge the water vapor with moisture, thereby avoiding the phenomenon of plastic particles agglomerating due to absorbing humid air as much as possible; in addition, the breathable film only allows gas to pass, thereby preventing the plastic particles in the feed funnel 42 from jumping out of the exhaust port 422 as much as possible.

[0037] The detection part 46 in this embodiment is configured as an ultrasonic sensor, which is installed on the outer wall of the feed pipe 41. The sound wave sensor is electrically connected to the control center. The ultrasonic sensor can emit ultrasonic waves, and the emitted ultrasonic waves can just cover the space between the filter screen 44 and the feeding screw 43. The ultrasonic waves emitted by the ultrasonic sensor can detect the size of the plastic particles in the space, and then determine whether there are plastic agglomerates on the filter screen 44 based on the size of the plastic particles; wherein, the principle of the ultrasonic sensor detecting the size of plastic particles is mainly that the ultrasonic sensor emits high-frequency sound waves, which will be reflected back when encountering an object and received by the sensor, and the sensor will transmit the signal to the control center, which will calculate the time it takes for the sound wave to propagate back and forth, and use the known speed of sound to determine the distance between the object and the sensor. After knowing the distance information, the volume of the object can be calculated in combination with the shape and size of the object.

[0038] The adjusting member 45 includes a mounting frame 451 , a fan 452 and a rotating motor 453 .

[0039] The mounting frame 451 is coaxially fixedly mounted on the inner wall of the air intake duct 411, the fan 452 is coaxially rotatably mounted on the mounting frame 451, the rotating motor 453 is mounted on the mounting frame 451, and the output shaft of the rotating motor 453 is coaxially fixedly connected to the fan 452, and the rotating motor 453 is electrically connected to the control center.

[0040] When the ultrasonic sensor detects the presence of plastic lumps on the filter mesh plate 44 and transmits a signal to the control center, the control center will transmit a signal to the rotating motor 453 and increase the rotation speed of the rotating motor 453, thereby increasing the rotation speed of the fan 452, and further increasing the flow rate of hot air in the intake duct 411; when the ultrasonic sensor detects that there are no plastic lumps on the filter mesh plate 44, the control center will transmit a signal to the rotating motor 453 to reduce the rotation speed, thereby reducing the rotation speed of the fan 452 and the flow rate of hot air in the intake duct 411.

[0041] Finally, the driving member 47 in this embodiment includes a bracket 471 and a driving motor 472 .

[0042] The bracket 471 is installed on the upper end surface of the feed funnel 42, and the drive motor 472 is installed on the bracket 471. The upper end surface of the feeding screw 43 extends to the outside of the feed funnel 42 and is coaxially fixedly connected to the output shaft of the drive motor 472. The drive motor 472 is also electrically connected to the control center. When the plastic particles in the feed funnel 42 need to be delivered to the molten barrel 32, the control center starts the drive motor 472, and the drive motor 472 drives the feeding screw 43 to rotate, so that the plastic particles in the feed funnel 42 enter the molten barrel 32 in a quantitative and orderly manner.

[0043] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A plastic pipe injection molding device, characterized in that: include: A machine base (1) having an upper end surface provided with a mold clamping assembly (2) for molding molten plastic; An injection assembly (3) comprising a melt barrel (32) and a push screw (33), wherein the melt barrel (32) is mounted on the machine base (1), an injection port (321) is provided at one end of the melt barrel (32), the injection port (321) is communicated with the mold clamping assembly (2), the push screw (33) is located in the melt barrel (32), an end of the push screw (33) away from the injection port (321) extends out of the melt barrel (32), and is connected to a drive assembly (34); The feeding assembly (4) comprises a feeding pipe (41), wherein the feeding pipe (41) is connected to the melting barrel (32), and a feeding port (421) is provided on the feeding pipe (41). A feeding screw (43) is coaxially arranged in the feeding pipe (41), and a driving member (47) is provided on the feeding pipe (41) for driving the feeding screw (43) to rotate. Plastic particles cannot pass through the gap between the side of the feeding screw (43) and the feeding pipe (41). The lower end of the feeding screw (43) is connected to a filter screen (44), and there is a certain angle between the axis of the filter screen (44) and the axis of the feeding screw (43). Plastic particles cannot pass through the gap between the side of the filter screen (44) and the feeding pipe (41). Plastic lumps falling on the filter screen (44) will be bounced up and collide with the inner wall of the feeding pipe (41) until they are broken.

2. The plastic pipe injection molding device according to claim 1, characterized in that: The feed pipe (41) is provided with an air intake pipe (411), an air guide channel (412) is provided in the peripheral wall of the feed pipe (41), a plurality of air outlets (413) are provided on the inner peripheral wall of the feed pipe (41), one end of the air intake pipe (411) away from the feed pipe (41) is connected to a hot air source, and the hot air ejected from the air outlets (413) can dry the plastic particles in the feed pipe (41).

3. The plastic pipe injection molding device according to claim 2, characterized in that: The plurality of gas outlets (413) are evenly spaced around the axis of the feed pipe (41), and the plurality of gas outlets (413) are all arranged obliquely in a direction close to the vertical upward direction. The gas ejected from the gas outlets (413) can blow the plastic particles or plastic agglomerates into the air, thereby increasing the contact area between the plastic particles or plastic agglomerates and the air, thereby facilitating the drying process.

4. The plastic pipe injection molding device according to claim 3, characterized in that: The air intake pipe (411) is provided with an adjusting member (45) for adjusting the flow velocity of gas in the air intake pipe (411), and the feed pipe (41) is provided with a detection member (46) for detecting whether there are plastic agglomerates on the filter mesh plate (44). When the detection member (46) detects the presence of plastic agglomerates on the filter mesh plate (44), the adjusting member (45) increases the flow velocity of gas in the air intake pipe (411) to accelerate the drying speed of the plastic agglomerates and enhance the degree of collision of the plastic agglomerates. When the detection member (46) detects the absence of plastic agglomerates on the filter mesh plate (44), the adjusting member (45) decreases the flow velocity of gas in the air intake pipe (411).

5. The plastic pipe injection molding device according to claim 4, characterized in that: The regulating member (45) comprises a mounting frame (451), a fan (452) and a rotating motor (453); the mounting frame (451) is coaxially mounted on the inner peripheral wall of the air intake duct (411); the fan (452) is rotatably mounted on the mounting frame (451); the rotating motor (453) is mounted on the mounting frame (451); and the output shaft of the rotating motor (453) is coaxially fixedly connected to the fan (452); the detecting member (46) is an ultrasonic sensor; and both the ultrasonic sensor and the rotating motor (453) are electrically connected to a control center.

6. The plastic pipe injection molding device according to claim 1, characterized in that: The upper end surface of the feed pipe (41) is provided with a feed funnel (42), the feed funnel is arranged in a closed type, and the feed port (421) is arranged on the feed funnel (42).

7. The plastic pipe injection molding device according to claim 6, characterized in that: The driving member (47) comprises a bracket (471) and a driving motor (472); the bracket (471) is mounted on the feeding hopper (42); the driving motor (472) is mounted on the bracket (471); the upper end surface of the feeding screw (43) extends to the outside of the feeding hopper (42) and is coaxially fixedly connected to the output shaft of the driving motor (472).

8. The plastic pipe injection molding device according to claim 7, characterized in that: An exhaust port (422) is provided at the upper end of the feed funnel (42), and a breathable film is provided at the exhaust port (422).

9. The plastic pipe injection molding device according to claim 7, characterized in that: A crushing assembly (5) is arranged in the feed hopper (42), and the crushing assembly (5) is used to perform preliminary crushing of plastic agglomerates.

10. The plastic pipe injection molding device according to claim 9, characterized in that: The crushing assembly (5) comprises two groups of crushing rollers (51), the two groups of crushing rollers (51) are arranged opposite to each other, and each group is provided with two crushing rollers (51), and the two crushing rollers (51) are both rotatably mounted on the inner wall of the feeding funnel (42), and a certain gap is left between the two crushing rollers (51), and the extension portion of the feeding screw (43) is coaxially fixedly connected to the first gear (52), and the two crushing rollers (51) in each group are coaxially fixedly connected to the second gear (53) and the third gear (54) at one end close to the first gear (52), and the first gear (52) and the second gear (53) are meshed, and the second gear (53) and the third gear (54) are meshed.

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