Injection molding equipment

Abstract

The invention relates to injection molding equipment, and belongs to the technical field of plastic molding equipment. The device comprises a rack, a charging barrel is arranged on the rack, a feeding hopper is arranged above the charging barrel, a sieve plate assembly, a magnetic attraction assembly and a dust removal fan are arranged in the feeding hopper, and the sieve plate assembly is arranged in an inner cavity of the feeding hopper in a matched and penetrating mode so that the inner cavity of the feeding hopper can be divided into an iron removal cavity and a dust removal cavity which are distributed up and down; meshes are formed in the screen mesh plate, and an impurity containing cavity is formed between the screen mesh plate and the support; the magnetic attraction assembly horizontally extends, can stretch into the iron removal cavity to adsorb impurities and can drive the adsorbed impurities to move upwards to leave the iron removal cavity, the dust removal fan is installed on the feeding hopper, a dust removal screen is arranged in the side wall of the feeding hopper, and the air outlet end of the dust removal fan communicates with the dust removal cavity and is opposite to the dust removal screen. The support is rotationally installed on the feeding hopper around the horizontal axis. The impurity removal effect on plastic particles in the feeding hopper is better, and frequent blockage of the nozzle can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding equipment, in particular to an injection molding equipment. Background Art

[0002] Injection molding equipment is a common mechanical equipment in the plastic processing industry. It is mainly used to inject thermoplastic or thermosetting plastics into molds after high-temperature melting, and then cool and shape them into products of the desired shape. Injection molding equipment is used in many fields such as automobiles, electronics, packaging, and medical care.

[0003] Injection molding equipment generally includes injection system, clamping system, hydraulic system and other components. Among them, the injection system includes barrel, screw, nozzle and other structures. The barrel is used to contain and heat plastic particles to melt them into a flowable plastic melt. The screw is installed in the barrel and pushes the plastic forward and mixes it evenly through rotation. At the same time, shear heat is generated to help plasticize the plastic particles. The nozzle connects the injection system and the mold to ensure that the melt enters the mold cavity smoothly. Generally, a filter screen is provided at the feed port of the nozzle to filter insoluble impurities. A feed hopper is generally connected to the barrel, and plastic particles are put into the barrel through the feed hopper.

[0004] The quality of plastic granules on the market varies. The quality of plastic granules produced by different manufacturers is not the same. In order to save costs, some plastic granule manufacturers are lax in controlling the quality of their products. In the impurity removal process before granulation, they simply remove the more obvious impurities in the plastic raw materials, while smaller metal debris, small stone particles and other impurities cannot be completely removed. The plastic granules produced in this way contain more impurities. If you accidentally purchase such plastic granules, the large amount of metal, gravel and other impurities in the plastic granules can easily cause the screw to wear and the filter screen at the nozzle to be frequently blocked. During the processing, the machine needs to be frequently stopped for cleaning, resulting in reduced production efficiency. In severe cases, it will also affect the service life of the injection molding equipment.

[0005] In the prior art, in order to avoid the above problems, the plastic particles are usually subjected to another impurity removal treatment before entering the barrel. For example, the patent with authorization announcement number CN209036867U discloses a metal magnetic suction feeding device for an injection molding machine. The device includes a machine body and a feeding funnel. A plurality of magnetic bars are arranged in the funnel neck of the feeding funnel. The plurality of magnetic bars are all mounted on a movable block. When the plastic particles fall, the magnetic bars can absorb the metal impurities in the plastic particles to prevent the metal impurities from entering the barrel.

[0006] The device allows the falling plastic particles to pass through the magnetic bar so that the metal impurities are adsorbed on the magnetic bar. However, the plastic particles only contact the magnetic bar once during the falling process. The falling speed of the plastic particles is fast, and the contact time with the magnetic bar is short. Moreover, not all plastic particles can contact the magnetic bar during the falling process, so the metal impurities in the plastic particles cannot be completely adsorbed by the magnetic bar. In addition, the device can only remove the metal impurities contained in the plastic particles, and cannot remove small particles of stones and dust in the plastic particles that can also cause screw wear and nozzle clogging. The device has a poor effect in removing impurities. Summary of the invention

[0007] The invention provides an injection molding device to solve the technical problem that a material discharge device with an impurity removal function in an injection molding machine in the prior art has a poor effect of removing impurities.

[0008] In order to solve the above problems, the present invention provides an injection molding device adopting the following technical solution: An injection molding device, comprising a frame, a barrel extending left and right is arranged on the frame, a feed hopper connected to the inner cavity of the barrel is arranged above the barrel, a screen plate assembly, a magnetic suction assembly and a dust removal fan are arranged in the feed hopper, the screen plate assembly is adapted to be arranged in the inner cavity of the feed hopper to separate the inner cavity of the feed hopper into an iron removal cavity and a dust removal cavity distributed up and down, the screen plate assembly comprises a support with an open top and a closed bottom and a screen plate installed on the top of the support, the screen plate is provided with mesh holes with an aperture size smaller than the outer diameter size of a standard plastic particle, and a miscellaneous cavity for accommodating small particle impurities is formed between the screen plate and the support; The magnetic attraction component extends horizontally, and the magnetic attraction component can extend into the iron removal chamber and rotate around the central axis of the iron removal chamber to absorb impurities, and can also move upward with the absorbed impurities to leave the iron removal chamber; The dust removal fan is installed on the feed hopper, and a dust removal screen is provided at a position corresponding to the dust removal chamber in the side wall of the feed hopper, and the air outlet end of the dust removal fan is connected to the dust removal chamber and is opposite to the dust removal screen; The support is rotatably installed on the feed hopper around a horizontal axis. The support can swing back and forth at a first set angle to screen small particles in the plastic particles into the impurity chamber. The support can also swing at a second set angle greater than the first set angle to allow the plastic particles above the screen plate to slide into the dust removal chamber.

[0009] By adopting the above technical scheme, plastic particles are put into the iron removal chamber, the plastic particles stay in the iron removal chamber, and the magnetic suction component extends into the iron removal chamber and contacts the plastic particles, which can absorb iron-containing metal impurities such as iron filings mixed in the plastic particles, and can also absorb plastic particles wrapped with iron-containing metals. The magnetic suction component can rotate in the iron removal chamber to move the plastic particles, and the position of the plastic particles is constantly changed by the movement, so that the magnetic suction component can fully contact with each part of the accumulated plastic particles and more thoroughly absorb the iron-containing metal impurities in the plastic particles. Compared with the method of using a magnetic rod to contact the falling plastic particles to absorb metal impurities in the prior art, the contact time of the magnetic suction component with the plastic particles in the present invention is longer, the contact is more complete, and the effect of absorbing metal impurities is better.

[0010] During the reciprocating swing of the screen plate assembly at the first set angle, the plastic particles in the iron removal chamber are driven to vibrate, and the small stones, small non-ferrous metal particles and plastic particles much smaller than the standard size mixed in the plastic particles can enter the impurity chamber through the mesh, and more types of impurities can be removed. Among them, since the smaller plastic particles have a larger surface area to volume ratio, they are prone to over-melting in the barrel. After removing this part of the plastic particles, it can be avoided that this part of the plastic particles is over-melted in the barrel to generate charred products and cause nozzle blockage.

[0011] After the plastic particles have been magnetically separated and vibrated, the screen plate assembly only needs to be rotated to a second angle to allow the plastic particles to fall into the dust removal chamber. The dust removal fan can be used to blow air toward the falling plastic particles during the falling process. The dust adhering to the plastic particles can be blown to the outside of the feed hopper through the dust removal screen, thereby effectively removing the dust adhering to the plastic particles and removing tiny impurities that were missed in the previous screening process.

[0012] Furthermore, the magnetic attraction component includes a magnetic attraction member and a scraper member, the magnetic attraction member includes an inner cylinder and an arc-shaped magnet, the inner cylinder extends horizontally, the two ends of the inner cylinder are closed and the top of the circumferential side wall is provided with a feed slot parallel to the axis of the inner cylinder, the central angle of the arc-shaped magnet is greater than 180°, the arc-shaped magnet is coaxially embedded in the circumferential side wall of the inner cylinder, the outer surface of the arc-shaped magnet is flush with the outer surface of the inner cylinder, the two end portions corresponding to the two ends of the arc in the arc-shaped magnet are arranged on both sides of the feed slot and a gap is provided between the feed slot, the scraper member can cover the outside of the feed slot to block the feed slot, and can also rotate around the axis of the magnetic attraction member on the outside of the magnetic attraction member to scrape impurities adsorbed by the arc-shaped magnet to the feed slot.

[0013] By adopting the above technical solution, the arc magnet can adsorb iron-containing metal impurities on the outer surface, the scraper can push the metal impurities on the arc magnet to the feed slot and collect the metal impurities in the inner cavity of the inner cylinder, and the metal impurities can be pushed away from the arc magnet by the scraper and collected in the inner cylinder. It is not necessary to remove the metal impurities from the magnetic suction member after each adsorption of the metal impurities. It is only necessary to clean the inner cylinder after the metal impurities are accumulated in the inner cylinder, which requires fewer cleaning times and saves more effort. Since both ends of the arc magnet are spaced from the feed slot, the magnetism of the metal impurities is weakened when they are pushed to the feed slot, so they can be separated from the outer surface of the inner cylinder and enter the inner cavity of the inner cylinder through the feed slot.

[0014] Furthermore, the scraper member includes an end cover, an arc-shaped sealing plate and a scraper. The end cover is buckled on one end of the inner cylinder, the arc-shaped sealing plate is connected to the end cover and coaxially abuts against the outer wall of the magnetic suction member, the scraper is obliquely connected to the front side of the rotation direction of the arc-shaped sealing plate, and a scraper drive assembly is provided on the frame. The scraper drive assembly is transmission-connected to the end cover to drive the end cover to rotate around the axis of the inner cylinder, and the end cover drives the arc-shaped sealing plate and the scraper to rotate on the circumferential outer wall of the magnetic suction member. The scraper can push impurities adsorbed on the arc-shaped magnet to the feed slot, and the arc-shaped sealing plate can cover the outside of the feed slot to seal the feed slot.

[0015] By adopting the above technical solution, the arc-shaped sealing plate can block the feed slot, the scraper can push metal impurities to move on the surface of the magnetic suction part, and the end cover is connected to the scraper drive assembly to drive the arc-shaped sealing plate and the scraper to rotate, with a simple structure.

[0016] Furthermore, a vertically extending movable shaft is provided on the frame, the bottom end of the movable shaft is vertically connected to the fixed shaft, the inner cylinder is coaxial with the fixed shaft and fixedly connected to the end of the fixed shaft facing away from the movable shaft, the end cover is rotatably mounted on the fixed shaft, the movable shaft can move downward to extend into the iron removal chamber, and rotate in the iron removal chamber to drive the magnetic attraction component to rotate in the iron removal chamber, and the movable shaft can also move upward to drive the magnetic attraction component to leave the iron removal chamber.

[0017] By adopting the above technical solution, the magnetic attraction component is driven to move up and down by the up and down movement of the movable shaft, so that the magnetic attraction component can be inserted into or leave the iron removal chamber, and the magnetic attraction component is driven to rotate in the iron removal chamber by the rotation of the movable shaft, and the structure is simple.

[0018] Furthermore, the scraper drive assembly includes a gear and a rack. The gear is rotatably mounted on a fixed shaft. The gear is located on the side of the end cover that is away from the magnetic element and is fixedly connected to the end cover. The rack extends vertically and is located above the feed hopper. The gear can move upward with the movable shaft and rotate when it engages with the rack to drive the scraper to rotate one circle on the magnetic element and scrape the adsorbed metal impurities into the inner cavity of the inner cylinder.

[0019] With the above technical solution, after the scraper moves upward with the movable shaft and leaves the iron removal chamber, the gear starts to mesh with the rack and rotates, thereby driving the scraper to rotate, converting the upward linear motion into the rotation of the scraper. The transmission structure is simple and ingenious. There is no need to set a power mechanism for driving the scraper to rotate, which can save power costs.

[0020] Furthermore, a shield is slidingly sleeved outside the fixed shaft, and the shield and the fixed shaft are prevented from rotating against each other. The shield is located on the side of the gear facing away from the end cover, and the shield is open at one end close to the gear and closed at the other end. An elastic telescopic rod is connected between the shield and the movable shaft, and the elastic telescopic rod applies an elastic force toward the gear to the shield, so that the shield cover is arranged outside the gear and pressed on the end cover; a shield push plate is also provided above the feed hopper, and the shield push plate is located on the side of the rack facing away from the magnetic suction component, and the shield push plate includes a straight plate section and an inclined plate section connected in sequence from top to bottom, and the inclined plate section is inclined from top to bottom toward the rack, and the inclined plate section is located below the rack, and the top end of the straight plate section is located above the rack. In the process of the shield moving upward with the movable shaft, the shield contacts the inclined plate section and is pushed by the inclined plate section to move away from the gear to expose the gear.

[0021] By adopting the above technical solution, when the magnetic suction assembly and the gear are located in the iron removal chamber, the protective cover is arranged on the outside of the gear, which can prevent the plastic particles in the iron removal chamber from contacting the gear and causing the gear to rotate. It can also prevent the plastic particles and other materials in the iron removal chamber from getting stuck between two adjacent meshing teeth in the gear, avoiding affecting the subsequent meshing of the gear and the rack.

[0022] Furthermore, a positioning rod is provided on one side of the shield close to the gear, and a positioning hole is provided on the gear. When the shield cover is arranged on the outer side of the gear, the positioning rod is inserted into the positioning hole.

[0023] By adopting the above technical solution, the positioning rod is inserted into the positioning hole, which can further prevent the gear from rotating. During the process of the gear rotating with the movable shaft in the iron removal chamber, the gear can always remain in a set position without deflection. In this way, the arc-shaped sealing plate also always remains in a state of blocking the feed slot to prevent the material from entering the inner cylinder.

[0024] Furthermore, the meshes include straight meshes and oblique meshes connected in sequence from top to bottom, the straight meshes are perpendicular to the screen plate, and the oblique meshes are inclined from top to bottom toward the dust removal screen.

[0025] By adopting the above technical solution, when the sieve plate assembly is turned downward, impurities in the impurity containing cavity will not slip out from the mesh holes.

[0026] Furthermore, the sieve plate assembly can be detachably mounted on the feed hopper, and an impurity outlet is provided at the bottom of the support in the sieve plate assembly, and a bottom sealing plate capable of sealing the impurity outlet is detachably connected to the impurity outlet.

[0027] By adopting the above technical solution, when there are a lot of impurities stored in the impurity containing cavity, the sieve plate assembly can be removed from the feed hopper, and the bottom sealing plate can be removed from the support to pour out the impurities, so as to facilitate the cleaning of the sieve plate assembly.

[0028] The beneficial effects of the injection molding equipment provided by the present invention are: better removal effect of ferrous metal impurities in plastic particles, more types of impurities that can be removed, better effect of removing impurities, ability to remove plastic particles with smaller volume, and more effective prevention of screw wear and nozzle clogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 A front view of an injection molding device provided by the present invention; Figure 2 A schematic diagram of the three-dimensional structure of an injection molding device provided by the present invention; Figure 3 A schematic structural diagram of a first-angle view of a feed hopper in an injection molding device provided by the present invention; Figure 4 A schematic structural diagram of a second viewing angle of a feed hopper in an injection molding device provided by the present invention; Figure 5 A schematic diagram of the structure of a movable shaft in an injection molding device provided by the present invention; Figure 6 A schematic diagram of the structure of a magnetic attraction component in an injection molding device provided by the present invention; Figure 7 A schematic diagram of the structure of a protective cover and a gear in an injection molding device provided by the present invention Figure 1 ; Figure 8 A schematic diagram of the structure of a protective cover and a gear in an injection molding device provided by the present invention Figure 2 ; Fig. 9 A schematic diagram of the three-dimensional structure of a sieve plate assembly in an injection molding device provided by the present invention; Fig.10 A three-dimensional cross-sectional view of a screen plate assembly in an injection molding device provided by the present invention.

[0030] Description of reference numerals: 1. Frame; 101. Base; 102. Cylinder support; 103. Bottom frame; 104. Top frame; 105. Fan support; 2. Cylinder; 3. Feed hopper; 301. Cylindrical section; 302. Conical section; 4. Fan; 5. Screen plate drive; 6. Rotating drive; 7. Lifting drive; 8. Mounting plate; 9. Movable shaft; 10. Rack; 11. Shield push plate; 111. Straight plate section; 112. Inclined plate section; 12. Screen plate; 121. Mesh; 13 , support seat; 14, sealing plate; 15, blocking block; 16, arc magnet; 17, scraper; 171, end cover; 172, arc sealing plate; 173, scraper; 18, inner cylinder; 181, feed slot; 19, shaft section; 20, fixed shaft; 21, elastic telescopic rod; 22, shield; 23, gear; 231, tapered guide hole section; 232, straight hole section; 24, thrust plate; 25, positioning rod; 26, support; 27, miscellaneous cavity; 28, dust removal screen. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] The following is one embodiment of an injection molding device provided by the present invention: like Figure 1-Figure 10 As shown, an injection molding device includes a frame 1, a barrel 2, a feed hopper 3, a screen plate assembly, a screen plate driving component 5, a movable shaft 9, a movable shaft driving assembly, a magnetic suction assembly, a scraper driving assembly, a shield 22, a shield push plate 11 and a dust removal fan 4.

[0033] like Figure 1 , Figure 2 As shown, the frame 1 includes a base 101, a barrel support 102, a fan support 105 and a main support. The base 101 is placed on a horizontal ground, the barrel support 102 is installed above the base 101 and is located on the right side of the base 101, the fan support 105 and the main support are both installed above the barrel support 102, and the main support includes a bottom frame 103 and a top frame 104 installed above the bottom frame 103, one end of the top frame 104 cantilevers to the left side of the bottom frame 103, and a vertically extending mounting plate 8 is connected to the bottom of the end.

[0034] like Figure 1 , Figure 2 As shown, the barrel 2 extends left and right, and the right end of the barrel 2 is fixedly mounted on the barrel support 102 .

[0035] like Figure 3 , Figure 4 As shown, the feed hopper 3 is installed above the barrel support 102, and the mounting plate 8 is located above the feed hopper 3. The feed hopper 3 includes a cylindrical section 301 and a conical section 302 connected in sequence from top to bottom, and the bottom end of the feed hopper 3 is connected to the barrel 2 and communicates with the inner cavity of the barrel 2. The front side of the bottom of the cylindrical section 301 is provided with a plurality of vertically extending strip perforations, which are arranged at equal intervals along the circumference of the cylindrical section 301, and the width of the strip perforations is 1 mm. The plurality of strip perforations form a dust removal screen 28 on the feed hopper 3.

[0036] The left and right sides of the cylindrical section 301 are provided with strip grooves with openings facing upwards, and the outer side of the cylindrical section 301 is also provided with two blocking plates 14, which are connected to the cylindrical section 301 by bolts, and the two blocking plates 14 are used to block the two strip grooves respectively, and the inner side of the blocking plate 14 is connected with a blocking block 15, which is inserted into the strip groove, and the inner side wall surface of the blocking block 15 is coplanar with the inner side wall surface of the cylindrical section 301. A semi-arc groove with an opening facing downwards is provided below the blocking plate 14 and the blocking block 15, and a circular through hole with an axis extending left and right is formed between the semi-arc groove and the bottom of the long strip groove.

[0037] The sieve plate assembly is located in the inner cavity of the feed hopper 3, dividing the inner cavity of the feed hopper 3 into an iron removal chamber and a dust removal chamber which are sequentially distributed up and down. Fig. 9 , Fig.10 As shown, the sieve plate assembly includes a support 26 and a sieve plate 12. The support 26 is open at the top and closed at the bottom. The outer peripheral wall of the support 26 is in an inverted cone shape. The outer diameter of the top of the support 26 matches the inner diameter of the cylindrical section 301. Two shaft sections 19 are connected to the outer peripheral wall of the support 26. Both shaft sections 19 extend in the left-right direction and are symmetrically arranged on the left and right sides of the support 26. The two shaft sections 19 are respectively penetrated in the two circular perforations mentioned above. An impurity outlet is provided at the bottom of the support 26. A bottom sealing plate capable of blocking the impurity outlet is detachably connected to the impurity outlet by screws.

[0038] The screen plate 12 is installed on the top of the support 26. The outer peripheral wall of the screen plate 12 is inverted cone shape, and the top surface of the screen plate 12 is flush with the top of the support 26. The screen plate 12 is densely covered with a plurality of mesh holes 121, and the mesh holes 121 include straight mesh holes and oblique mesh holes connected in sequence from top to bottom. The straight mesh holes are perpendicular to the plate surface of the screen plate 12, and the oblique mesh holes are inclined forward from top to bottom. The outer diameter of the top of the screen plate 12 matches the outer diameter of the top of the support 26, and a cavity 27 for accommodating small particles of impurities is formed between the screen plate 12 and the support 26.

[0039] like Figure 3 , Figure 4As shown, the screen plate driving member 5 adopts a servo motor, which is installed on the above-mentioned base frame 103. The servo motor is a motor with a reducer, and the servo motor is transmission-connected to the above-mentioned shaft section 19 located on the right side through a coupling.

[0040] The servo motor can drive the screen plate assembly to swing back and forth quickly within the first set angle, and the first set angle is 1°. The process of the screen plate assembly swinging back and forth within the first set angle is equivalent to the continuous vibration of the screen plate assembly. The screen plate assembly drives the material in the iron removal chamber to shake continuously. The small stone particles in the iron removal chamber and the plastic particles whose size is much smaller than the standard plastic particle size can pass through the mesh 121 on the screen plate 12 and enter the impurity chamber 27 under the shaking action. During the process of the screen plate assembly swinging back and forth within the first set angle, the gap between the top of the screen plate assembly and the inner wall of the cylindrical section 301 is extremely small, which is not enough to make the material in the iron removal chamber fall.

[0041] The servo motor can also drive the front side of the sieve plate assembly to swing downward to a second angle greater than the first set angle after the sieve plate assembly continuously swings to complete the screening, so as to form a larger gap between the sieve plate assembly and the cylindrical section 301. The plastic particles remaining above the sieve plate assembly fall into the dust removal chamber through the gap, and due to the setting of the inclined mesh holes, the impurities in the impurity containing chamber 27 will not slide out through the mesh holes 121.

[0042] The movable shaft 9 is coaxial with the feed hopper 3. Figure 5 As shown, the bottom end of the movable shaft 9 is vertically connected with a fixed shaft 20, and the fixed shaft 20 is detachably connected to the movable shaft 9, so that when the metal impurities are fully collected, the fixed shaft 20 and the magnetic suction assembly installed on the fixed shaft 20 can be removed for cleaning. The specific detachable connection method is: two lugs arranged opposite to each other are provided at the end of the fixed shaft 20, and the two lugs are connected to the movable shaft 9 by connecting bolts. By removing the connecting bolts, the fixed shaft 20 can be removed from the movable shaft 9.

[0043] like Figure 5 As shown, the movable shaft driving assembly includes a lifting drive member 7 and a rotating drive member 6. The lifting drive member 7 adopts a lifting cylinder. The lifting output end of the lifting drive member 7 is connected to a support seat 13, and the rotating drive member 6 is installed on the support seat 13. The rotating drive member 6 adopts a rotating motor. The rotating drive member 6 is connected to the movable shaft 9 through a coupling. The lifting drive member 7 can drive the support seat 13, the rotating drive member 6 and the movable shaft 9 to move up and down, thereby driving the bottom end of the movable shaft 9 to insert downward into the iron removal chamber or to leave the iron removal chamber upward. The rotating drive member 6 can drive the movable shaft 9 to rotate, so as to drive the fixed shaft 20 to rotate around the axis of the cylindrical section 301 when the bottom end of the movable shaft 9 is inserted into the iron removal chamber.

[0044] like Figure 6As shown, the magnetic attraction component includes a magnetic attraction member and a scraper member 17 , and the magnetic attraction member includes an inner cylinder 18 and an arc-shaped magnet 16 .

[0045] The axis of the inner cylinder 18 extends along the radial direction of the cylindrical section 301, and both ends of the inner cylinder 18 are closed. A feed slot 181 extending along the radial direction of the cylindrical section 301 is provided at the top of the circumferential outer wall of the inner cylinder 18, and the feed slot 181 is connected to the inner cavity of the inner cylinder 18. A mounting slot is also provided on the circumferential outer wall of the inner cylinder 18, and the cross section of the mounting slot is arc-shaped, and the two ends of the mounting slot in the circumferential direction maintain the same distance from the feed slot 181. The inner cylinder 18 is coaxial with the above-mentioned fixed shaft 20, and one end of the inner cylinder 18 is fixedly connected to the fixed shaft 20.

[0046] The arc magnet 16 is embedded in the above-mentioned installation groove. The thickness of the arc magnet 16 is equal to the groove depth of the above-mentioned installation groove. The circumferential outer surface of the arc magnet 16 is flush with the circumferential outer surface of the inner tube 18. The arc magnet 16 can be a permanent magnet or an electromagnet. When the arc magnet 16 is an electromagnet, it can completely lose its magnetism by turning off the power, which makes it easier for metal impurities to fall into the inner cavity of the inner tube 18.

[0047] The scraper 17 includes an end cover 171, an arc-shaped sealing plate 172 and a scraper 173. The end cover 171 is rotatably mounted on the fixed shaft 20 and is covered at the end of the inner cylinder 18. The arc-shaped sealing plate 172 is connected to the end cover 171, and extends radially along the cylindrical section 301. The arc-shaped sealing plate 172 is coaxial with the magnetic suction member and abuts against the outer wall of the magnetic suction member. The width of the arc-shaped sealing plate 172 is greater than the slot width of the feed slot 181. When the magnetic suction assembly is located in the iron removal chamber, the arc-shaped sealing plate 172 rotates to the top of the inner cylinder 18 and blocks the feed slot 181. The scraper 173 extends radially along the cylindrical section 301. The scraper 173 is obliquely connected to the arc-shaped sealing plate 172 and is located at the front side of the rotation direction of the arc-shaped sealing plate 172. A receiving groove for receiving metal impurities is formed between the scraper 173 and the circumferential outer surface of the magnetic suction member.

[0048] like Figure 5 , Figure 7 , Figure 8As shown, the scraper drive assembly includes a gear 23 and a rack 10. The gear 23 is rotatably mounted on the fixed shaft 20 and is located on the side of the end cover 171 close to the movable shaft 9. The gear 23 is fixedly connected to the end cover 171 and can rotate synchronously with the end cover 171. The gear 23 is provided with a positioning hole extending along the axis direction of the gear 23. The positioning hole includes a conical guide hole section 231 and a straight hole section 232 connected in sequence along the direction toward the end cover 171. The rack 10 extends vertically and is fixedly mounted on the mounting plate 8. When the gear 23 moves upward with the movable shaft 9, it can mesh with the rack 10 and rotate one circle. During the rotation, the scraper 17 is driven to rotate one circle outside the magnetic suction member. The scraper 173 scrapes the metal impurities adsorbed on the arc magnet 16 into the inner cavity of the inner cylinder 18, and then the arc sealing plate 172 blocks the feed slot 181 again.

[0049] The shield 22 is mounted on the fixed shaft 20 to prevent rotation. The shield 22 is located on the side of the gear 23 that faces away from the end cover 171. The end of the shield 22 that faces the gear 23 is open, and the end that faces away from the gear 23 is closed. An elastic telescopic rod 21 is connected between the shield 22 and the movable shaft 9. The elastic telescopic rod 21 applies an elastic force to the shield 22 toward the gear 23, so that the end of the shield 22 is pressed on the end cover 171, and the gear 23 is completely contained in the inner cavity of the shield 22 to prevent plastic particles from being stuck in the interval between the meshing teeth in the gear 23 and affecting the meshing of the gear 23 and the rack 10. A positioning rod 25 parallel to the fixed shaft 20 is provided on the inner side of the shield 22. When the magnetic suction assembly is located in the iron removal chamber, the positioning rod 25 is inserted into the positioning hole on the gear 23 to prevent the gear 23 from rotating, so that the arc-shaped sealing plate 172 can remain in a state of blocking the feed slot 181. A thrust plate 24 is also fixedly connected to the side of the shield 22 facing away from the gear 23 . The thrust plate 24 is located on the side of the shield 22 facing the rack 10 .

[0050] like Figure 5 As shown, the shield push plate 11 is installed on the above-mentioned mounting plate 8 and is located on the side of the rack 10 facing away from the magnetic attraction component. The shield push plate 11 includes a straight plate section 111 and an inclined plate section 112 connected in sequence from top to bottom. The straight plate section 111 is parallel to the rack 10 and longer than the rack 10. The top of the straight plate section 111 is higher than the top of the rack 10. The horizontal spacing dimension between the straight plate section 111 and the rack 10 is greater than the width dimension of the shield 22. The inclined plate section 112 is located below the rack 10, and the inclined plate section 112 is inclined from top to bottom toward the rack 10 and is staggered with the rack 10 in the horizontal direction. As the shield 22 moves upward with the movable shaft 9, the inclined plate section 112 contacts the thrust plate 24 and pushes the thrust plate 24 to move back toward the gear 23, thereby driving the shield 22 to move back toward the gear 23, exposing the gear 23, and at the same time, the positioning rod 25 disengages from the positioning hole, and the rotation of the gear 23 is not restricted by the positioning rod 25, which facilitates the subsequent engagement of the gear 23 with the rack 10.

[0051] like Figure 3 , Figure 4 As shown, the fan 4 is installed on the fan support 105, the air outlet end of the fan 4 is connected to the inner cavity of the feed hopper 3, and the air outlet end of the fan 4 is opposite to the dust removal screen 28 in front and back. The fan 4 blows toward the dust removal screen 28 during the falling process of the plastic particles on the screen plate assembly to blow out the dust and tiny impurities mixed in the plastic particles.

[0052] When the present invention is used, the purchased plastic particles are placed in the iron removal chamber in the feed hopper 3, and then the rotary drive member 6 is started to drive the movable shaft 9 to rotate, driving the magnetic suction component to rotate in the iron removal chamber, and the magnetic suction component continuously moves the plastic particles in the iron removal chamber, and the arc magnet 16 absorbs the exposed metal debris mixed in the plastic particles and the plastic particles containing metal inside. After the magnetic suction component rotates in the iron removal chamber for a set period of time, the lifting drive member 7 is started, and the lifting drive member 7 drives the movable shaft 9 to move upward, so that the magnetic suction component leaves the iron removal chamber.

[0053] During the upward movement of the magnetic suction component, the thrust plate 24 on the shield 22 first contacts the inclined plate section 112, and is pushed by the inclined plate section 112 to drive the shield 22 to move back to the gear 23, so that the gear 23 is exposed. At the same time, the positioning rod 25 is disengaged from the positioning hole on the gear 23, and the thrust plate 24 continues to move upward and begins to contact the straight plate section 111, so that the gear 23 remains in an exposed state. Then the gear 23 begins to mesh with the rack 10, and the rack 10 drives the gear 23 to rotate one circle, and the gear 23 drives the scraper 17 to rotate one circle, and the arc-shaped sealing plate 172 rotates again from the position where the feed slot 181 is blocked to the position where the feed slot 181 is blocked. During the rotation, the scraper 173 pushes the metal impurities adsorbed on the arc-shaped magnet 16 to move toward the feed slot 181, and pushes these metal impurities from the feed slot 181 into the inner cavity of the inner cylinder 18, thereby collecting the metal impurities.

[0054] Afterwards, the lifting drive member 7 drives the movable shaft 9 to move downward so that the magnetic attraction component can be extended into the iron removal chamber again to absorb the metal. During the downward movement, the gear 23 meshes with the rack 10 and rotates in the opposite direction for one circle. The arc-shaped sealing plate 172 is driven to rotate in the opposite direction for one circle and blocks the feed slot 181 again. The thrust plate 24 moves downward until it is disengaged from the inclined plate section 112. The shield 22 is again covered on the outside of the gear 23, and the positioning rod 25 is again inserted into the positioning hole on the gear 23. If the position of the gear 23 during the lifting process has a small deflection from the position in the initial state, the positioning rod 25 can drive the gear 23 to deflect by pushing the hole wall of the conical guide hole section 231, guiding the positioning rod 25 to insert into the straight hole section 232, so that the gear 23 is completely reset, and the arc-shaped sealing plate 172 is kept in a state of completely blocking the feed slot 181.

[0055] The magnetic suction component is repeatedly extended into the iron removal chamber and rotated in the iron removal chamber to move the plastic particles to absorb the metal impurities in the plastic particles. By observing the arc magnet 16 leaving the iron removal chamber, when the arc magnet 16 no longer absorbs metal impurities, it is proved that the metal impurities in the plastic particles have been removed.

[0056] At this time, the screen plate driving member 5 is started to drive the screen plate assembly to swing back and forth quickly within the first set angle, so that the material in the iron removal chamber is shaken, and the small stone particles contained in the material and the plastic particles whose size is much smaller than the standard plastic particle size all pass through the mesh 121 and fall into the impurity chamber 27. After that, the screen plate driving member 5 is controlled again to make the front side of the screen plate assembly swing downward at a second angle, and the dust removal fan 4 is started at the same time, and the plastic particles left above the screen plate assembly fall into the dust removal chamber. The dust removal fan 4 blows air toward the falling plastic particles, and the dust adhering to the plastic particles and the small particles of impurities that were missed in the previous screening link are blown to the outside of the feed hopper 3 by the dust removal screen 28, and the plastic particles remaining in the feed hopper 3 fall into the barrel 2, and are sprayed into the injection mold by the nozzle after hot melting.

[0057] The present invention can effectively remove metal debris in plastic particles and plastic particles containing metal inside, and can also remove impurities such as plastic particles whose sizes are much smaller than the standard plastic particles, small particles of stone, dust and the like in the plastic particles, with better impurity removal effect and more conducive to preventing nozzle clogging.

Claims

1. An injection molding device, comprising a frame, a barrel extending left and right is provided on the frame, and a feed hopper connected to the inner cavity of the barrel is provided above the barrel, characterized in that: The feed hopper is provided with a sieve plate assembly, a magnetic suction assembly and a dust removal fan. The sieve plate assembly is adapted to be inserted into the inner cavity of the feed hopper to divide the inner cavity of the feed hopper into an iron removal chamber and a dust removal chamber distributed up and down. The sieve plate assembly includes a support with an open top and a closed bottom and a sieve plate installed on the top of the support. The sieve plate is provided with mesh holes with an aperture size smaller than the outer diameter size of the standard plastic particles. A miscellaneous cavity for accommodating small particles of impurities is formed between the sieve plate and the support. The magnetic attraction component extends horizontally, and the magnetic attraction component can extend into the iron removal chamber and rotate around the central axis of the iron removal chamber to absorb impurities, and can also move upward with the absorbed impurities to leave the iron removal chamber; The dust removal fan is installed on the feed hopper, and a dust removal screen is provided at a position corresponding to the dust removal chamber in the side wall of the feed hopper, and the air outlet end of the dust removal fan is connected to the dust removal chamber and is opposite to the dust removal screen; The support is rotatably installed on the feed hopper around a horizontal axis. The support can swing back and forth at a first set angle to screen small particles in the plastic particles into the impurity chamber. The support can also swing at a second set angle greater than the first set angle to allow the plastic particles above the screen plate to slide into the dust removal chamber.

2. An injection molding device according to claim 1, characterized in that: The magnetic attraction component includes a magnetic attraction member and a scraper member. The magnetic attraction member includes an inner cylinder and an arc-shaped magnet. The inner cylinder extends horizontally, the two ends of the inner cylinder are closed, and the top of the circumferential side wall is provided with a feed slot parallel to the axis of the inner cylinder. The central angle of the arc-shaped magnet is greater than 180°. The arc-shaped magnet is coaxially embedded on the circumferential side wall of the inner cylinder. The outer surface of the arc-shaped magnet is flush with the outer surface of the inner cylinder. The two end parts corresponding to the two ends of the arc in the arc-shaped magnet are arranged on both sides of the feed slot and a gap is provided between the feed slot. The scraper member can cover the outside of the feed slot to block the feed slot, and can also rotate around the axis of the magnetic attraction member on the outside of the magnetic attraction member to scrape impurities adsorbed by the arc-shaped magnet to the feed slot.

3. An injection molding device according to claim 2, characterized in that: The scraper member includes an end cover, an arc-shaped sealing plate and a scraper. The end cover is buckled on one end of the inner cylinder, the arc-shaped sealing plate is connected to the end cover and coaxially abuts against the outer wall of the magnetic suction member, the scraper is obliquely connected to the front side of the rotation direction of the arc-shaped sealing plate, and a scraper drive assembly is provided on the frame. The scraper drive assembly is transmission-connected to the end cover to drive the end cover to rotate around the axis of the inner cylinder, and the end cover drives the arc-shaped sealing plate and the scraper to rotate on the circumferential outer wall of the magnetic suction member. The scraper can push impurities adsorbed on the arc-shaped magnet to the feed slot, and the arc-shaped sealing plate can cover the outside of the feed slot to seal the feed slot.

4. An injection molding device according to claim 3, characterized in that: A vertically extending movable shaft is provided on the frame, and the bottom end of the movable shaft is vertically connected to a fixed shaft. The inner cylinder is coaxial with the fixed shaft and is fixedly connected to the end of the fixed shaft facing away from the movable shaft. The end cover is rotatably mounted on the fixed shaft. The movable shaft can move downward to extend into the iron removal chamber, and rotate in the iron removal chamber to drive the magnetic attraction component to rotate in the iron removal chamber. The movable shaft can also move upward to drive the magnetic attraction component to leave the iron removal chamber.

5. An injection molding device according to claim 4, characterized in that: The scraper drive assembly includes a gear and a rack. The gear is rotatably mounted on a fixed shaft. The gear is located on the side of the end cover that is away from the magnetic attraction part and is fixedly connected to the end cover. The rack extends vertically and is located above the feed hopper. The gear can move upward with the movable shaft and rotate when it engages with the rack to drive the scraper to rotate one circle on the magnetic attraction part and scrape the adsorbed metal impurities into the inner cavity of the inner cylinder.

6. An injection molding device according to claim 5, characterized in that: A shield is provided on the sliding sleeve outside the fixed shaft, and the shield and the fixed shaft are prevented from rotating against each other. The shield is located on the side of the gear that faces away from the end cover, and the shield is open at one end close to the gear and closed at the other end. An elastic telescopic rod is connected between the shield and the movable shaft, and the elastic telescopic rod applies an elastic force toward the gear to the shield, so that the shield cover is arranged outside the gear and pressed on the end cover; a shield push plate is also provided above the feed hopper, and the shield push plate is located on the side of the rack that faces away from the magnetic suction component, and the shield push plate includes a straight plate section and an inclined plate section connected in sequence from top to bottom, and the inclined plate section is inclined from top to bottom toward the rack, and the inclined plate section is located below the rack, and the top end of the straight plate section is located above the rack. In the process of the shield moving upward with the movable shaft, the shield contacts the inclined plate section and is pushed by the inclined plate section to move away from the gear to expose the gear.

7. An injection molding device according to claim 6, characterized in that: A positioning rod is arranged on one side of the shield close to the gear, and a positioning hole is arranged on the gear. When the shield cover is arranged on the outer side of the gear, the positioning rod is inserted into the positioning hole.

8. An injection molding device according to any one of claims 1 to 7, characterized in that: The meshes include straight meshes and oblique meshes which are connected in sequence from top to bottom, the straight meshes are perpendicular to the screen plate, and the oblique meshes are inclined from top to bottom toward the dust removal screen.

9. An injection molding device according to any one of claims 1 to 7, characterized in that: The sieve plate assembly can be detachably mounted on the feed hopper, and an impurity outlet is arranged at the bottom of the support in the sieve plate assembly, and a bottom sealing plate capable of sealing the impurity outlet is detachably connected to the impurity outlet.

Images