An injection molding device for medical plastic products

Abstract

The present invention discloses an injection molding device for medical plastic products, which relates to the technical field of injection molding machines and includes an installation table, an injection molding unit, an anti-blocking unit, and a cleaning unit. The installation table is used to install and fix the injection molding unit, the anti-blocking unit, and the cleaning unit. The injection molding unit is used for the extrusion molding of molten materials. The anti-blocking unit is used to solve the accumulation of molten materials at the injection nozzle. The cleaning unit is used to remove the influence of the molten materials attached to the mold surface during the mold forming process due to uneven heating, resulting in defects such as holes in the products. During the injection molding process of medical plastic products, when the injection molding unit is performing the injection molding process and it is detected that there is accumulated or agglomerated material at the injection nozzle, the anti-blocking unit is used to clean the agglomerated material. At the same time, the cleaning unit is used to remove the granular attachments that have entered the mold surface along with the normal material, thereby improving the product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding machines, and specifically to an injection molding device for medical plastic products. Background Art

[0002] In the field of injection molding production of medical plastic products, the performance of the injection molding device is closely related to the product quality. However, the current injection molding devices for medical plastic products face many technical challenges. Among them, the problems of material accumulation and caking at the injection nozzle and granular attachment on the mold surface due to uneven material heating are particularly prominent, seriously restricting the development of the industry and the improvement of product quality.

[0003] The injection nozzle is a key channel for the material to enter the mold cavity from the barrel in the injection molding device. Its normal operation plays a decisive role in the stability of the entire injection molding process and the product quality. During the injection molding process of medical plastic products, due to the combined influence of various factors, material accumulation and caking are very likely to occur at the injection nozzle. The material accumulation and caking at the injection nozzle will bring a series of serious consequences. First of all, it will cause the blockage of the injection nozzle, making the material unable to smoothly enter the mold cavity, directly resulting in the interruption of the injection molding process and reducing the production efficiency. Secondly, the caked material may be forcibly extruded during the subsequent injection molding process and mixed into the normal material flow and enter the mold cavity, thus forming defects such as inclusions and holes inside the medical plastic products, seriously affecting the quality and performance of the products. The granular attachment of the material on the mold surface will have various adverse effects on medical plastic products. In terms of appearance, these granular attachments will make the product surface rough and uneven, seriously affecting the aesthetics of the product.

[0004] In addition, the granular attachment will also increase the cleaning difficulty and frequency of the mold, and reduce the service life of the mold. After each injection molding cycle, additional time and manpower are required to clean the mold to remove the granular material on the surface. This not only increases the production cost, but also the frequent cleaning operations may cause damage to the mold surface, further shortening the service life of the mold. Summary of the Invention

[0005] The purpose of the present invention is to provide an injection molding device for medical plastic products to solve the problems raised in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] The described injection molding device for medical plastic products includes an installation table, an injection molding unit, an anti-blocking unit, and a cleaning unit. The installation table is placed on a horizontal foundation. The injection molding unit is fixedly installed at one end of the installation table away from the horizontal foundation. The anti-blocking unit is rotatably connected to the injection molding unit. The anti-blocking unit has the function of cleaning caked materials. The anti-blocking unit is fixedly connected to the cleaning unit. The cleaning unit is fixedly installed on the surface of one end of the installation table away from the horizontal foundation. The cleaning unit has the function of cleaning the injection molding unit.

[0008] The installation table is used to install and fix the injection molding unit, the anti-blocking unit, and the cleaning unit. The injection molding unit is used for the extrusion molding of molten materials. The anti-blocking unit is used to solve the accumulation of molten materials at the injection nozzle. The cleaning unit is used to remove the influence of molten materials attached to the mold surface due to uneven heating during the mold forming process, resulting in defective holes and other problems in the product. During the injection molding process of medical plastic products, when the injection molding unit is in the injection molding process and it is detected that there is accumulated and caked material at the injection nozzle, the anti-blocking unit is used to clean the caked material. At the same time, the cleaning unit is used to remove the granular attachments that have entered the mold surface with the normal material, thereby improving the product quality.

[0009] Furthermore, the injection molding unit includes a motor, a barrel, a hopper, a screw, a support rod, a mold one, a mold two, and an injection nozzle. The fixed end of the motor is fixedly installed on the surface of one end of the installation table away from the horizontal foundation. The output end of the motor penetrates the barrel and is fixedly connected to the screw. The barrel is fixedly installed on the surface of one end of the installation table away from the horizontal foundation through the support rod. The hopper is fixedly installed on the side of the barrel away from the installation table. The hopper is conductively connected to the barrel through a conduit. The screw is rotatably installed inside the barrel. The mold one is conductively connected to the end of the injection nozzle away from the motor. The mold two is slidably installed on the surface of one end of the installation table away from the horizontal foundation. The injection nozzle is fixedly connected to the end of the barrel away from the motor. The barrel is rotatably connected to the anti-blocking unit.

[0010] When the material enters the barrel from the inside of the hopper, the external controller controls the motor to start, thereby driving the screw to rotate. Under the pushing action of the screw, the material is uniformly heated and stirred while flowing from the injection nozzle to the mold one. The controller controls the mold two to move closer to the mold one. After the material is shaped in the mold cavity, the mold two moves away, so that the formed mold drops into the collection barrel.

[0011] Further, the anti-blocking unit includes a toothed ring, a pinion gear, an internal and external toothed ring, a spring telescopic rod, a conductive block, a fixed ring plate, bevel gears and a telescopic scraper. The toothed ring is rotatably connected to the barrel. The pinion gear is slidably installed on the outer surface of the screw rod away from the motor. The internal and external toothed ring is rotatably installed on the outer surface of the barrel. One end of the spring telescopic rod is fixedly connected to the pinion gear, and the other end is fixedly connected to the conductive block. The conductive block is slidably installed in the hole opened on the fixed ring plate. The fixed ring plate is fixedly installed on the outer surface of the screw rod. The bevel gear is fixedly connected to the cleaning unit. The toothed ring and the internal and external toothed ring are connected by the bevel gear. The fixed end of the telescopic scraper is fixedly installed on the toothed ring.

[0012] Further, the anti-blocking unit further includes a telescopic spring, a first electrode plate, a second electrode plate, an elastic spiral belt, a plugging cover, a pressure receiving plate, a heating rod and a buffer spring. The telescopic end of the telescopic scraper is fixedly connected to the plugging cover. The telescopic scraper is connected to the pressure receiving plate through the telescopic spring. The first electrode plate is fixedly installed on the surface of the pressure receiving plate close to the telescopic scraper. The second electrode plate is fixedly installed on the side of the telescopic scraper close to the pressure receiving plate. One end of the elastic spiral belt is fixedly connected to the plugging cover, and the other end is slidably connected to the screw rod through a sliding rod. The heating rod is rotatably installed on the telescopic scraper. One end of the buffer spring is fixedly connected to the telescopic scraper, and the other end is fixedly connected to the heating rod. The heating rod is electrically connected to the second electrode plate.

[0013] When the staff finds that there is material accumulation or material caking at the injection nozzle, at this time, an electric current is passed into the toothed ring through an external controller, so that the toothed ring presents polarity. On the one hand, it pushes the pinion gear to move and compress the spring telescopic rod. At the same time, under the action of the spring telescopic rod, the conductive block contacts the inside of the hole of the fixed ring plate. At this time, the pinion gear meshes with the internal teeth of the internal and external toothed ring, so that the rotation of the screw rod drives the pinion gear and the internal and external toothed ring to rotate, and then drives the toothed ring to rotate under the driving action of the bevel gear. On the other hand, the polarity of the toothed ring pushes the plugging cover to move to the right to block the injection nozzle, preventing the un-uniformly heated material from continuing to enter the mold one through the injection nozzle. When the plugging cover moves to the right, it stretches the elastic spiral belt and at the same time pulls the telescopic scraper to extend. At the same time, under the push of the elastic spiral belt, it pushes the heating rod to stretch the buffer spring and rotate. Then, under the action of the rotation of the toothed ring, it drives the telescopic scraper to rotate, scraping off the material accumulated on the inner wall of the injection nozzle and mixing it with the normal material, thus avoiding the situation of blockage caused by long-term material accumulation at the injection nozzle. When the telescopic scraper rotates, the pressure receiving plate contacts the caked material and squeezes the telescopic spring, so that the first electrode plate and the second electrode plate are driven to contact each other under the push of the material. At this time, the current of the controller flows into the heating rod through the first electrode plate and the second electrode plate, making the heating rod heat up to fully stir and heat the caked material and the normal material, improving the mixing uniformity of the material, and thus improving the product quality.

[0014] Furthermore, the cleaning unit includes a rotating rod, a special-shaped wheel, a fixed plate, a mounting frame, a push rod, a slider, a push rod, a tension spring and a cleaning block, one end of the rotating rod is fixedly connected to the bevel gear, and the other end is fixedly connected to the fixed plate, the special-shaped wheel is fixedly mounted on the rotating rod, the fixed plate is fixedly mounted on the surface of one end of the mounting platform away from the horizontal foundation, the mounting frame is fixedly mounted on the fixed plate, the push rod is slidably mounted on the mounting frame, the end of the push rod away from the special-shaped wheel is connected to the fixed plate through a tension spring, the slider is fixedly mounted in the middle of the push rod, the slider is slidably mounted in a slot opened on the push rod, the push rod is slidably mounted on the mounting frame, and the end of the push rod away from the mounting frame is fixedly connected to the cleaning block.

[0015] When the bevel gear rotates, the special-shaped wheel starts to rotate under the transmission action of the rotating rod. When the special-shaped wheel contacts the push rod, it pushes the push rod to move to the right to compress the tension spring. When the special-shaped wheel does not contact the push rod, the push rod moves to the left under the action of the restoring force of the tension spring itself. During the left and right movement of the push rod, the slider is driven to move in the slot in the push rod, and relative movement is generated with the push rod, so that the left and right movement of the slider is converted into the forward and backward movement of the push rod. During the forward and backward movement of the mounting frame, the push rod drives the cleaning block to move synchronously, thereby cleaning the granular impurities attached to the surfaces of the mold one and the mold two, thereby avoiding the influence of the granular impurities on the appearance defects of the product and improving the product quality.

[0016] Furthermore, the injection nozzle is made of transparent material.

[0017] In order to facilitate the staff to observe whether there is accumulation and agglomeration of materials at the injection nozzle, and to avoid agglomeration, the unevenly heated materials are forced to mix directly with the normal materials and enter the mold for cooling and molding, which may lead to problems such as defective holes in the product and cause product quality problems.

[0018] Furthermore, the gear ring is made of an electromagnet, the pinion is made of a magnet, and the sealing cover is made of a magnet.

[0019] In order to facilitate the discovery of the agglomeration problem of the material at the injection nozzle caused by uneven heating, the gear ring of the electromagnet receives the current with the opposite polarity to the pinion and the blocking cover, thereby pushing the pinion and the blocking cover away from the electromagnet, and cooperating with other structures of the anti-blocking unit to remove the agglomerated materials and mix them evenly with normal materials, and then the injection molding machine works again. At the same time, the granular materials attached to the mold surface are removed by the cleaning unit to avoid affecting the subsequent product quality.

[0020] Furthermore, the diameter of the elastic spiral belt gradually increases from one end of the sealing cover to one end of the gear ring, and the rotation direction of the screw rod is opposite to that of the elastic spiral belt.

[0021] First, when the elastic spiral belt with a gradually increasing diameter rotates, it can cover a larger spatial range and generate a stronger stirring effect on the agglomerated materials at the injection nozzle. This can effectively break the agglomeration state of the agglomerated materials and make them disperse more evenly. Second, as the diameter of the elastic spiral belt increases, its pushing and squeezing effects on the materials also gradually increase. This helps to overcome the viscosity and resistance of the materials at the injection nozzle. Since the rotation direction of the elastic spiral belt is opposite to that of the screw, the materials are more likely to flow towards the screw under the thrust, thus promoting the mixing between the agglomerated materials and other normal materials, improving the overall mixing effect, and preventing the materials from agglomerating and blocking at the injection nozzle again.

[0022] Furthermore, the small gear is not engaged with the internal teeth of the internal and external tooth-shaped rings in the initial state.

[0023] To avoid the obstruction of the normal material transportation caused by the engagement of the small gear and the internal and external tooth-shaped rings in the initial state, which affects the working efficiency.

[0024] Furthermore, the special-shaped wheel is composed of a disc and multiple long rods.

[0025] To push the push rod to move through the multiple contacts of the special-shaped wheel with the push rod, so that the slider and the ejector rod produce relative movement, driving the cleaning block to scrape the granular impurities attached to the inner surface of the mold cavity, avoiding the defects caused by their existence in the molding mold and affecting the appearance quality of the product.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. The present invention passes an electric current through the tooth ring through the controller to present polarity. On the one hand, it pushes the small gear to move and engage with the internal teeth of the internal and external tooth-shaped rings, driving the small gear and the internal and external tooth-shaped rings to rotate under the rotation of the screw, and then driving the tooth ring to rotate under the driving action of the bevel gear. On the other hand, the polarized tooth ring pushes the sealing cover to move to the right to block the injection nozzle, while stretching the elastic spiral belt and the telescopic scraper to elongate. Under the push of the elastic spiral belt, the heating rod is pushed to stretch the buffer spring and rotate. Then, under the action of the rotation of the tooth ring, the telescopic scraper rotates to scrape the materials accumulated on the inner wall of the injection nozzle and mix them with the normal materials, thus avoiding the situation of blockage caused by the long-term accumulation of materials at the injection nozzle. When the telescopic scraper rotates, the pressure plate contacts the agglomerated materials and pushes the first electrode plate and the second electrode plate to contact each other. At this time, the current of the controller flows into the heating rod through the first electrode plate and the second electrode plate, making the heating rod heat up to fully stir and heat the agglomerated materials and the normal materials, improving the mixing uniformity of the materials and thus improving the product quality.

[0028] 2. During the contact and separation process between the special-shaped wheel and the push rod in the present invention, the push rod is pushed to move left and right, driving the slider to move in the notch of the ejector rod, generating relative movement with the ejector rod. Thus, the left and right movement of the slider is converted into the front and back movement of the ejector rod, and at the same time, driving the cleaning block to move synchronously back and forth to clean the granular impurities attached to the surfaces of the first mold and the second mold, thereby avoiding the influence of granular impurities on the appearance defects of the product and improving the product quality.

[0029] 3. When the elastic spiral belt with a gradually increasing diameter rotates in the present invention, it covers a larger spatial range and generates a stronger stirring effect, breaking the agglomeration state of the caked materials and making them more evenly dispersed. As the diameter of the elastic spiral belt increases, the pushing and extrusion of the materials are increased, enabling the materials to overcome the viscosity and resistance at the injection nozzle. With the rotation direction of the elastic spiral belt opposite to that of the screw, the materials are more likely to flow towards the screw under the action of the thrust, thereby promoting the mixing between the caked materials and other normal materials, further improving the overall mixing effect, and at the same time preventing the materials from caking and blocking again at the injection nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall external structure of an injection molding device for medical plastic products according to the present invention;

[0031] Figure 2 is a schematic diagram of the top view structure of an injection molding device for medical plastic products according to the present invention;

[0032] Figure 3 is an injection molding device for medical plastic products according to the present invention Figure 2 sectional view structure diagram at A - A;

[0033] Figure 4 is an injection molding device for medical plastic products according to the present invention Figure 2 partial enlarged view structure diagram at B;

[0034] Figure 5 is a schematic diagram of the internal structure of the barrel of an injection molding device for medical plastic products according to the present invention;

[0035] Figure 6 is an injection molding device for medical plastic products according to the present invention Figure 5 partial enlarged view structure diagram at C;

[0036] Figure 7 is a schematic diagram of the internal structure of the injection nozzle of an injection molding device for medical plastic products according to the present invention;

[0037] Figure 8 is a schematic diagram of the installation position structure of a partial anti - blocking unit of an injection molding device for medical plastic products according to the present invention;

[0038] Figure 9 Schematic diagram of the external structure of the cleaning unit of an injection molding device for a medical plastic product of the present invention;

[0039] Figure 10 For an injection molding device for a medical plastic product of the present invention Figure 9 Schematic diagram of the enlarged partial view of the structure at position D in it.

[0040] In the figure: 1. Installation table; 2. Injection molding unit; 21. Motor; 22. Barrel; 23. Hopper; 24. Screw; 25. Support rod; 26. Mold one; 27. Mold two; 28. Injection nozzle; 3. Anti-blocking unit; 31. Tooth ring; 32. Small gear; 33. Inner and outer tooth-shaped ring; 34. Spring telescopic rod; 35. Conductive block; 36. Fixed ring plate; 37. Bevel gear; 38. Telescopic scraping plate; 39. Telescopic spring; 310. First electrode plate; 311. Second electrode plate; 312. Elastic spiral band; 313. Sealing cover; 314. Pressure receiving plate; 315. Heating rod; 316. Buffer spring; 4. Cleaning unit; 41. Rotating rod; 42. Special-shaped wheel; 43. Fixed plate; 44. Mounting frame; 45. Push rod; 46. Slide block; 47. Thrust rod; 48. Tensile spring; 49. Cleaning block. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment: As Figures 1 - 10 shown, the present invention provides a technical solution:

[0043] As Figure 1 , 2 shown, an injection molding device for a medical plastic product includes an installation table 1, an injection molding unit 2, an anti-blocking unit 3 and a cleaning unit 4. The installation table 1 is placed on a horizontal foundation. The injection molding unit 2 is fixedly installed at one end of the installation table 1 away from the horizontal foundation. The anti-blocking unit 3 is rotationally connected to the injection molding unit 2. The anti-blocking unit 3 has the function of cleaning agglomerated materials. The anti-blocking unit 3 is fixedly connected to the cleaning unit 4. The cleaning unit 4 is fixedly installed on the surface of one end of the installation table 1 away from the horizontal foundation. The cleaning unit 4 has the function of cleaning the injection molding unit 2.

[0044] The installation platform 1 is used to install and fix the injection molding unit 2, the anti-blocking unit 3 and the cleaning unit 4. The injection molding unit 2 is used for the extrusion molding of molten materials. The anti-blocking unit 3 is used to solve the accumulation of molten materials at the injection nozzle 28. The cleaning unit 4 is used to remove the influence of the molten materials attached to the mold surface due to uneven heating during the mold forming process, which may cause defects such as holes in the product. During the injection molding process of medical plastic products, when the injection molding unit 2 is performing the injection molding process and it is detected that there is accumulated or caked material at the injection nozzle 28, the anti-blocking unit 3 is used to clean the caked material, and at the same time, the cleaning unit 4 is used to remove the granular attachments that have entered the mold surface with the normal material, thereby improving the product quality.

[0045] As Figure 1 、 2 、3, and 5 show, the injection molding unit 2 includes a motor 21, a barrel 22, a hopper 23, a screw 24, a support rod 25, a mold one 26, a mold two 27 and an injection nozzle 28. The fixed end of the motor 21 is fixedly installed on the surface of the installation platform 1 away from the horizontal base. The output end of the motor 21 passes through the barrel 22 and is fixedly connected to the screw 24. The barrel 22 is fixedly installed on the surface of the installation platform 1 away from the horizontal base through the support rod 25. The hopper 23 is fixedly installed on the side of the barrel 22 away from the installation platform 1. The hopper 23 is connected to the barrel 22 through a conduit. The screw 24 is rotatably installed inside the barrel 22. The mold one 26 is connected to the end of the injection nozzle 28 away from the motor 21. The mold two 27 is slidably installed on the surface of the installation platform 1 away from the horizontal base. The injection nozzle 28 is fixedly connected to the end of the barrel 22 away from the motor 21. The barrel 22 is rotatably connected to the anti-blocking unit 3.

[0046] When the material enters the barrel 22 from inside the hopper 23, the external controller controls the motor 21 to start, thereby driving the screw 24 to rotate. Under the pushing action of the screw 24, the material is uniformly heated and stirred while flowing from the injection nozzle 28 to the mold one 26. The controller controls the mold two 27 to move closer to the mold one 26. After the material is shaped in the mold cavity, the mold two 27 moves away, so that the formed mold drops into the collection barrel.

[0047] As Figure 4 、 6As shown in Figures 7 and 8, the anti-blocking unit 3 includes a toothed ring 31, a pinion 32, an internal and external toothed ring 33, a spring telescopic rod 34, a conductive block 35, a fixed ring plate 36, a bevel gear 37 and a telescopic scraper 38. The toothed ring 31 is rotatably connected to the barrel 22. The pinion 32 is slidably mounted on the outer surface of the screw rod 24 away from the motor 21. The internal and external toothed ring 33 is rotatably mounted on the outer surface of the barrel 22. One end of the spring telescopic rod 34 is fixedly connected to the pinion 32, and the other end is fixedly connected to the conductive block 35. The conductive block 35 is slidably mounted in the hole formed in the fixed ring plate 36. The fixed ring plate 36 is fixedly mounted on the outer surface of the screw rod 24. The bevel gear 37 is fixedly connected to the cleaning unit 4. The toothed ring 31 and the internal and external toothed ring 33 are connected by the bevel gear 37. The fixed end of the telescopic scraper 38 is fixedly mounted on the toothed ring 31.

[0048] As Figure 6 , 7 shown, the anti-blocking unit 3 further includes a telescopic spring 39, a first electrode plate 310, a second electrode plate 311, an elastic spiral band 312, a plugging cover 313, a pressure receiving plate 314, a heating rod 315 and a buffer spring 316. The telescopic end of the telescopic scraper 38 is fixedly connected to the plugging cover 313. The telescopic scraper 38 is connected to the pressure receiving plate 314 through the telescopic spring 39. The first electrode plate 310 is fixedly mounted on the surface of the pressure receiving plate 314 close to the telescopic scraper 38. The second electrode plate 311 is fixedly mounted on the side of the telescopic scraper 38 close to the pressure receiving plate 314. One end of the elastic spiral band 312 is fixedly connected to the plugging cover 313, and the other end is slidably connected to the screw rod 24 through a slide bar. The heating rod 315 is rotatably mounted on the telescopic scraper 38. One end of the buffer spring 316 is fixedly connected to the telescopic scraper 38, and the other end is fixedly connected to the heating rod 315. The heating rod 315 is electrically connected to the second electrode plate 311.

[0049] When the staff discovers material accumulation or material caking at the injection nozzle 28, an electric current is passed through the toothed ring 31 by an external controller at this time, so that the toothed ring 31 presents polarity. On the one hand, it pushes the pinion 32 to move and compress the spring telescopic rod 34. At the same time, under the action of the spring telescopic rod 34, the conductive block 35 contacts the inside of the hole of the fixed ring plate 36. At this time, the pinion 32 meshes with the internal teeth of the internal and external toothed rings 33. Thus, the rotation of the screw 24 drives the pinion 32 and the internal and external toothed rings 33 to rotate, and then drives the toothed ring 31 to rotate under the driving action of the bevel gear 37. On the other hand, the toothed ring 31 presents polarity and pushes the sealing cover 313 to move to the right to block the injection nozzle 28, preventing the ununiformly heated material from continuing to enter the mold 1-26 through the injection nozzle 28. When the sealing cover 313 moves to the right, it stretches the elastic spiral belt 312 and at the same time pulls the telescopic scraper 38 to elongate. At the same time, under the push of the elastic spiral belt 312, it pushes the heating rod 315 to stretch the buffer spring 316 and rotate. Thus, under the action of the rotation of the toothed ring 31, it drives the telescopic scraper 38 to rotate, scraping off the material accumulated on the inner wall of the injection nozzle 28 and mixing it with the normal material, thereby avoiding the occurrence of blockage due to long-term material accumulation at the injection nozzle 28. When the telescopic scraper 38 rotates, the pressure receiving plate 314 contacts and squeezes the telescopic spring 39 with the caked material, and then drives the first electrode plate 310 and the second electrode plate 311 to contact each other under the push of the material. At this time, the current of the controller flows into the heating rod 315 through the first electrode plate 310 and the second electrode plate 311, making the heating rod 315 generate heat to fully stir and heat the caked material and the normal material, improving the mixing uniformity of the material, and thus improving the product quality.

[0050] As Figure 9 、 10 shown, the cleaning unit 4 includes a rotating rod 41, a special-shaped wheel 42, a fixing plate 43, a mounting frame 44, a push rod 45, a slider 46, a top rod 47, a tension spring 48 and a cleaning block 49. One end of the rotating rod 41 is fixedly connected to the bevel gear 37, and the other end is fixedly connected to the fixing plate 43. The special-shaped wheel 42 is fixedly installed on the rotating rod 41. The fixing plate 43 is fixedly installed on the surface of one end of the mounting table 1 away from the horizontal base. The mounting frame 44 is fixedly installed on the fixing plate 43. The push rod 45 is slidably installed on the mounting frame 44. One end of the push rod 45 away from the special-shaped wheel 42 is connected to the fixing plate 43 through the tension spring 48. The slider 46 is fixedly installed in the middle of the push rod 45. The slider 46 is slidably installed in the notch opened on the top rod 47. The top rod 47 is slidably installed on the mounting frame 44. One end of the top rod 47 away from the mounting frame 44 is fixedly connected to the cleaning block 49.

[0051] When the bevel gear 37 rotates, under the transmission action of the rotating rod 41, the shaped wheel 42 starts to rotate. When the shaped wheel contacts the push rod 45, the push rod 45 is pushed to move to the right to compress the tension spring 48. When the shaped wheel 42 is not in contact with the push rod 45, under the action of the restoring force of the tension spring 48 itself, the push rod 45 moves to the left. During the left and right movement of the push rod 45, the slider 46 is driven to move in the groove of the push rod 47, and relative movement is generated with the push rod 47, so that the left and right movement of the slider 46 is converted into the forward and backward movement of the push rod 47. During the forward and backward movement of the mounting frame 44, the push rod 47 drives the cleaning block 49 to move synchronously, thereby cleaning the granular impurities attached to the surfaces of the mold 1 26 and the mold 2 27, thereby avoiding the appearance defects of the product caused by the granular impurities and improving the product quality.

[0052] like Figure 1 As shown, the injection nozzle 28 is made of a transparent material.

[0053] In order to facilitate the staff to observe whether there is accumulation and agglomeration of materials at the injection nozzle 28, and to avoid agglomeration, the unevenly heated materials are forced to mix directly with the normal materials and enter the mold for cooling and molding, which may cause problems such as defective holes in the product and cause product quality problems.

[0054] like Figure 7 As shown, the gear ring 31 is made of an electromagnet, the pinion 32 is made of a magnet, and the blocking cover 313 is made of a magnet.

[0055] In order to facilitate the discovery of the agglomeration problem of the material at the injection nozzle 28 caused by uneven heating, the gear ring 31 made of the electromagnet material receives current with a polarity opposite to that of the pinion 32 and the blocking cover 313, thereby pushing the pinion 32 and the blocking cover 313 away from the electromagnet, and the agglomerated materials are removed and evenly mixed with normal materials through the other structures of the anti-blocking unit 3, and then the injection molding machine works again. At the same time, the granular materials attached to the mold surface are removed through the cleaning unit 4 to avoid affecting the subsequent product quality.

[0056] like Figure 6 As shown, the diameter of the elastic spiral belt 312 gradually increases from one end of the blocking cover 313 to one end of the gear ring 31 , and the rotation direction of the screw rod 24 is opposite to that of the elastic spiral belt 312 .

[0057] First, when the elastic spiral belt 312 with a gradually increasing diameter rotates, it can cover a larger spatial range, generating a stronger stirring effect on the agglomerated materials at the injection nozzle 28, effectively breaking the agglomeration state of the agglomerated materials and making them more evenly dispersed. Second, as the diameter of the elastic spiral belt 312 increases, its pushing and squeezing effects on the materials also gradually increase, which helps to overcome the viscosity and resistance of the materials at the injection nozzle 28. Since the rotation direction of the elastic spiral belt 312 is opposite to that of the screw 24, the materials are more likely to flow towards the screw 24 under the thrust, thereby promoting the mixing between the agglomerated materials and other normal materials, improving the overall mixing effect, and preventing the materials from agglomerating and blocking at the injection nozzle 28 again.

[0058] As Figure 6 shown, the pinion gear 32 and the internal teeth of the internal and external tooth-shaped ring 33 are not engaged in the initial state.

[0059] To avoid the pinion gear 32 being engaged with the internal and external tooth-shaped ring 33 in the initial state, which may block the conveyance of normal materials and affect the working efficiency.

[0060] As Figure 9 shown, the special-shaped wheel 42 is composed of a disc and multiple long rods.

[0061] To enable the special-shaped wheel 42 to contact the push rod 45 multiple times, thereby pushing the push rod 45 to move, causing relative movement between the slider 46 and the ejector rod 47, and driving the cleaning block 49 to scrape the granular impurities attached to the inner surface of the mold cavity, avoiding defects in the mold during molding and affecting the appearance quality of the product.

[0062] The working principle of the present invention:

[0063] When the materials enter the barrel 22 from the inside of the hopper 23, the external controller controls the motor 21 to start, driving the screw 24 to rotate. Under the pushing action of the screw 24, the materials are evenly heated and stirred while flowing from the injection nozzle 28 to the mold one 26. The controller controls the mold two 27 to move closer to the mold one 26. After the materials are shaped in the mold cavity, the mold two 27 moves away, causing the molded mold to fall into the collection barrel.

[0064] When the staff discovers material accumulation or material caking at the injection nozzle 28, at this time, an electric current is passed into the toothed ring 31 through an external controller, so that the toothed ring 31 presents polarity. On the one hand, it pushes the pinion 32 to move and compress the spring telescopic rod 34. At the same time, under the action of the spring telescopic rod 34, the conductive block 35 contacts the inside of the hole of the fixed ring plate 36. At this time, the pinion 32 meshes with the internal teeth of the internal and external tooth-shaped rings 33. Thus, the rotation of the screw 24 drives the pinion 32 and the internal and external tooth-shaped rings 33 to rotate. Thus, under the driving action of the bevel gear 37, the toothed ring 31 is driven to rotate. On the other hand, the toothed ring 31 presenting polarity pushes the sealing cover 313 to move to the right, blocking the injection nozzle 28, avoiding the un-uniformly heated material from continuing to enter the mold one 26 through the injection nozzle 28. When the sealing cover 313 moves to the right, it stretches the elastic spiral belt 312 and at the same time pulls the telescopic scraper 38 to elongate. At the same time, under the push of the elastic spiral belt 312, the heating rod 315 is pushed to stretch the buffer spring 316 and rotate. Thus, under the action of the rotation of the toothed ring 31, the telescopic scraper 38 is driven to rotate, scraping off the material accumulated on the inner wall of the injection nozzle 28 and mixing it with the normal material, thus avoiding the situation of blockage caused by long-term material accumulation at the injection nozzle 28. When the telescopic scraper 38 rotates, the pressure receiving plate 314 contacts the caked material and compresses the telescopic spring 39. Thus, under the push of the material, the first electrode plate 310 and the second electrode plate 311 are driven to contact each other. At this time, the current of the controller flows into the heating rod 315 through the first electrode plate 310 and the second electrode plate 311, making the heating rod 315 generate heat to fully stir and heat the caked material and the normal material, improving the mixing uniformity of the material, and thus improving the product quality.

[0065] When the bevel gear 37 rotates, under the transmission action of the rotating rod 41, the special-shaped wheel 42 is driven to start rotating. When the special-shaped wheel contacts the push rod 45, it pushes the push rod 45 to move to the right and compress the tension spring 48. When the special-shaped wheel 42 does not contact the push rod 45, under the action of the self-restoring force of the tension spring 48, the push rod 45 moves to the left. During the left and right movement of the push rod 45, the slider 46 is driven to move in the notch of the ejector rod 47, generating relative movement with the ejector rod 47. Thus, the left and right movement of the slider 46 is converted into the front and back movement of the ejector rod 47. During the front and back movement of the ejector rod 47 in the mounting frame 44, the cleaning block 49 is driven to move synchronously, thus cleaning the granular impurities attached to the surfaces of the mold one 26 and the mold two 27, thus avoiding the appearance defects of the product caused by the granular impurities and improving the product quality.

[0066] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A medical plastic product injection molding device, characterized in that: The described medical plastic product injection molding device includes a mounting table (1), an injection molding unit (2), a blockage prevention unit (3), and a cleaning unit (4). The mounting table (1) is placed on a horizontal base. The injection molding unit (2) is fixedly installed at one end of the mounting table (1) away from the horizontal base. The blockage prevention unit (3) is rotatably connected to the injection molding unit (2). The blockage prevention unit (3) has the function of cleaning caked materials. The blockage prevention unit (3) is fixedly connected to the cleaning unit (4). The cleaning unit (4) is fixedly installed on the surface of one end of the mounting table (1) away from the horizontal base. The cleaning unit (4) has the function of cleaning the injection molding unit (2). The injection molding unit (2) includes a motor (21), a barrel (22), a hopper (23), a screw (24), a support rod (25), a mold one (26), a mold two (27), and an injection nozzle (28). The fixed end of the motor (21) is fixedly installed on the surface of one end of the mounting table (1) away from the horizontal base. The output end of the motor (21) passes through the barrel (22) and is fixedly connected to the screw (24). The barrel (22) is fixedly installed on the surface of one end of the mounting table (1) away from the horizontal base through the support rod (25). The hopper (23) is fixedly installed on one side of the barrel (22) away from the mounting table (1). The hopper (23) is conductively connected to the barrel (22) through a conduit. The screw (24) is rotatably installed inside the barrel (22). The mold one (26) is conductively connected to one end of the injection nozzle (28) away from the motor (21). The mold two (27) is slidably installed on the surface of one end of the mounting table (1) away from the horizontal base. The injection nozzle (28) is fixedly connected to one end of the barrel (22) away from the motor (21). The barrel (22) is rotatably connected to the blockage prevention unit (3). The blockage prevention unit (3) includes a toothed ring (31), a small gear (32), an internal and external toothed ring (33), a spring telescopic rod (34), a conductive block (35), a fixed ring plate (36), a bevel gear (37), and a telescopic scraper (38). The toothed ring (31) is rotatably connected to the barrel (22). The small gear (32) is slidably installed on the outer surface of one end of the screw (24) away from the motor (21). The internal and external toothed ring (33) is rotatably installed on the outer surface of the barrel (22). One end of the spring telescopic rod (34) is fixedly connected to the small gear (32), and the other end is fixedly connected to the conductive block (35). The conductive block (35) is slidably installed in a hole opened on the fixed ring plate (36). The fixed ring plate (36) is fixedly installed on the outer surface of the screw (24). The bevel gear (37) is fixedly connected to the cleaning unit (4). The toothed ring (31) is connected to the internal and external toothed ring (33) through the bevel gear (37). The fixed end of the telescopic scraper (38) is fixedly installed on the toothed ring (31). The anti-blocking unit (3) further includes a telescopic spring (39), a first electrode plate (310), a second electrode plate (311), an elastic spiral belt (312), a sealing cover (313), a pressure receiving plate (314), a heating rod (315) and a buffer spring (316). The telescopic end of the telescopic scraper (38) is fixedly connected to the sealing cover (313). The telescopic scraper (38) is connected to the pressure receiving plate (314) through the telescopic spring (39). The first electrode plate (310) is fixedly installed on the surface of the pressure receiving plate (314) near one end of the telescopic scraper (38). The second electrode plate (311) is fixedly installed on the side of the telescopic scraper (38) near the pressure receiving plate (314). One end of the elastic spiral belt (312) is fixedly connected to the sealing cover (313), and the other end is slidably connected to the screw rod (24) through a sliding rod. The heating rod (315) is rotatably installed on the telescopic scraper (38). One end of the buffer spring (316) is fixedly connected to the telescopic scraper (38), and the other end is fixedly connected to the heating rod (315). The heating rod (315) is electrically connected to the second electrode plate (311).

2. The injection molding device for medical plastic products according to claim 1, characterized in that: The cleaning unit (4) includes a rotating rod (41), a special-shaped wheel (42), a fixing plate (43), a mounting frame (44), a push rod (45), a slider (46), a top rod (47), a tension spring (48) and a cleaning block (49). One end of the rotating rod (41) is fixedly connected to the bevel gear (37), and the other end is fixedly connected to the fixing plate (43). The special-shaped wheel (42) is fixedly installed on the rotating rod (41). The fixing plate (43) is fixedly installed on the surface of the mounting table (1) away from one end of the horizontal base. The mounting frame (44) is fixedly installed on the fixing plate (43). The push rod (45) is slidably installed on the mounting frame (44). One end of the push rod (45) away from the special-shaped wheel (42) is connected to the fixing plate (43) through the tension spring (48). The slider (46) is fixedly installed in the middle of the push rod (45). The slider (46) is slidably installed in the notch formed on the top rod (47). The top rod (47) is slidably installed on the mounting frame (44). One end of the top rod (47) away from the mounting frame (44) is fixedly connected to the cleaning block (49).

3. The injection molding device for medical plastic products according to claim 1, characterized in that: The injection nozzle (28) is made of a transparent material.

4. The injection molding device for medical plastic products according to claim 1, characterized in that: The material of the toothed ring (31) is an electromagnet, the material of the small gear (32) is a magnet, and the material of the sealing cover (313) is a magnet.

5. The injection molding device for medical plastic products according to claim 1, characterized in that: The diameter of the elastic spiral belt (312) gradually increases from one end of the sealing cover (313) to one end of the toothed ring (31), and the helix direction of the screw rod (24) is opposite to that of the elastic spiral belt (312).

6. The injection molding device for medical plastic products according to claim 1, wherein: The small gear (32) is not engaged with the internal teeth of the internal and external toothed ring (33) in the initial state.

7. A medical plastic product injection molding device according to claim 2, characterized in that: The special-shaped wheel (42) is composed of a disc and a plurality of long rods.

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