Injection molding machine feed filter

Abstract

The application discloses an injection molding machine feeding filtering device, which comprises a feeding hopper and a material bucket. A first electromagnetic valve is arranged at the lower end of the feeding hopper, and a material suction assembly is arranged at the upper end of the feeding hopper. The material suction assembly comprises a material suction bin arranged at the upper end of the feeding hopper, a material falling pipe arranged at the lower end of the material suction bin and communicated with the feeding hopper, a material suction fan arranged at the upper end of the material suction bin, a filter screen arranged at the upper end of the material suction bin and below the air suction port of the material suction fan, an exhaust pipe arranged on the material suction fan, a material suction hose connected with the material suction bin below the filter screen at one end, and a material suction gun pipe arranged at the end of the material suction hose away from the material suction bin and used for extending into the material bucket. After the material suction fan provides suction force to the material suction hose, the material suction gun pipe can suck plastic particles from the material bucket into the material suction bin, and impurities are adsorbed on the filter screen. At this time, the plastic particles entering the feeding hopper can be filtered.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of injection molding machine design, in particular to an injection molding machine feeding filtering device. BACKGROUND

[0002] The working principle of the injection molding machine is similar to that of a syringe for injection, that is, the plastic in a molten state (i.e. in a viscous flow state) is injected into a closed mold cavity by the pushing force of a screw (or plunger), and the product is obtained after solidification and setting. Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding - plasticizing - pressure injection - mold filling and cooling - mold opening and part taking. After the plastic part is taken out, the mold is closed again for the next cycle.

[0003] At present, a high polymer material injection molding machine is disclosed in Chinese Patent No. CN116238092, published on June 9, 2023, which comprises a rack, a mold module arranged at the left end of the rack, a base arranged at the right end of the rack, an injection molding module installed on the base, an inlet frame arranged at the upper end of the injection molding module, inlet cavities symmetrically arranged at the left and right ends of the inlet frame, a crushing module arranged in the inlet cavities, a driving module arranged between the crushing modules, the driving module arranged in a working groove arranged in the middle of the inlet frame, and a cutting roller rotatably arranged at the lower end of the inlet cavity.

[0004] The plastic particle material is supplied through the inlet frame, and the plastic particle material contains a large amount of impurities. If these impurities are not filtered, the product quality of the injection molding will be affected. SUMMARY

[0005] The purpose of the present application is to provide an injection molding machine feeding filtering device that can filter plastic particles entering the feeding hopper.

[0006] The above technical purpose of the present application is achieved by the following technical scheme: an injection molding machine feeding filtering device, comprising a feeding hopper arranged on an injection molding machine and used for feeding plastic particles, and a material bucket arranged on the ground below the feeding hopper and used for pouring plastic particles, wherein a first electromagnetic valve is arranged at the lower end of the feeding hopper, a material suction assembly is arranged at the upper end of the feeding hopper, the material suction assembly comprises a material suction bin arranged at the upper end of the feeding hopper, a material falling pipe arranged at the lower end of the material suction bin and communicated with the feeding hopper, a material suction fan arranged at the upper end of the material suction bin, a filter screen arranged at the upper end of the material suction bin and below the suction port of the material suction fan, an exhaust pipe arranged on the material suction fan, a material suction hose connected to the material suction bin below the filter screen at one end, and a material suction gun pipe arranged at the end of the material suction hose away from the material suction bin and used for extending into the material bucket.

[0007] By adopting the technical scheme, when the plastic particles in the feeding hopper need to be put in, the suction fan is started and the first electromagnetic valve is closed, the suction fan provides suction force to the suction hose, the suction gun pipe can suck the plastic particles from the barrel into the suction bin, the suction force of the plastic particles in the suction bin is reduced, and thus the plastic particles fall into the feeding hopper under the action of gravity, the impurities in the plastic particles are light in weight and thus are adsorbed on the filter screen, and thus the plastic particles in the feeding hopper can be filtered.

[0008] The application further provides that the feeding hopper is provided with a blowing pipe communicating with the lower end of the feeding hopper, the upper end of the blowing pipe is provided with a blowing fan with an air outlet end communicating with the upper end of the blowing pipe, and the sidewall of the feeding hopper is provided with a connecting table for connecting the blowing fan.

[0009] By adopting the technical scheme, when the plastic particles in the feeding hopper need to be put in, the suction fan is started and the first electromagnetic valve is closed, the suction fan provides suction force to the suction hose, the suction gun pipe can suck the plastic particles from the barrel into the suction bin, the suction force of the plastic particles in the suction bin is reduced, and thus the plastic particles fall into the feeding hopper under the action of gravity, the impurities in the plastic particles are light in weight and thus are adsorbed on the filter screen, and thus the plastic particles in the feeding hopper can be filtered.

[0010] The application further provides that the lower end of the discharging pipe is provided with a second electromagnetic valve, one side of the connecting table and located at the blowing pipe is provided with a collecting pipe, the lower end of the collecting pipe is provided with a filter collecting bag, one end of the suction hose connected with the air inlet end of the blowing fan is arranged on the blowing fan, the dust suction pipe connected with the end of the suction hose away from the blowing fan is arranged on the upper end of the discharging pipe, the connecting table is provided with a driving cylinder with a piston rod end connected with the blowing fan and used for driving the blowing fan to move back and forth so that the air outlet end of the blowing fan is connected with the blowing pipe or the collecting pipe, and the third electromagnetic valve is arranged on the dust suction pipe.

[0011] By adopting the technical scheme, when the plastic particles in the feeding hopper need to be put in, the suction fan is started and the first electromagnetic valve is closed, the suction fan provides suction force to the suction hose, the suction gun pipe can suck the plastic particles from the barrel into the suction bin, the suction force of the plastic particles in the suction bin is reduced, and thus the plastic particles fall into the feeding hopper under the action of gravity, the impurities in the plastic particles are light in weight and thus are adsorbed on the filter screen, and thus the plastic particles in the feeding hopper can be filtered.

[0012] When the impurities are collected, the injection fan is pushed by the driving cylinder to be connected with the injection pipe, so that the plastic particles in the lower end of the feeding hopper can fall smoothly;

[0013] When the plastic particles need to be put into the feeding hopper again, the second electromagnetic valve and the suction fan are opened, and the first electromagnetic valve and the third electromagnetic valve are closed, so that the plastic particles can be smoothly sucked into the feeding hopper from the bucket.

[0014] The lower end of the dust suction pipe is connected with the discharging pipe, and the upper end extends upwardly and obliquely.

[0015] By adopting the above technical scheme, the lower end of the dust suction pipe is connected with the discharging pipe, and the upper end extends upwardly and obliquely, so that the plastic particles falling in the discharging pipe can be prevented from entering the dust suction pipe.

[0016] The further setting of the present application is that arc-shaped positioning plates are arranged on the connecting table and located on the sides away from each other of the injection pipe and the collecting pipe.

[0017] By adopting the above technical scheme, when the driving cylinder pushes the injection fan, the arc-shaped positioning plates can position the position of the injection fan after moving, so that the outflow end of the injection fan can be accurately connected with the injection pipe or the collecting pipe.

[0018] The further setting of the present application is that a magnet pipe is arranged at the middle position in the bucket and is used for passing through the suction gun pipe and attracting the iron impurities in the plastic particles to the inner wall of the suction gun pipe.

[0019] By adopting the above technical scheme, in order to avoid that the plastic particles entering the feeding hopper have iron impurities, the magnet pipe is arranged in the bucket and passes through the suction gun pipe, when the plastic particles are sucked into the suction gun pipe, the iron impurities in the plastic particles are attracted to the inner wall of the suction gun pipe under the strong attraction of the magnet pipe, so that the possibility of the iron impurities entering the feeding hopper is reduced, and the iron impurities are cleaned.

[0020] The further setting of the present application is that a ring-shaped receiving cavity extending in the vertical direction and used for receiving the iron impurities is formed in the lower end surface of the magnet pipe, and a lifting assembly for driving the suction gun pipe to move up and down and in and out of the magnet pipe is arranged on the connecting table.

[0021] By adopting the above technical scheme, the material suction gun pipe is driven by the lifting assembly to move upward and leave the material barrel, and because the iron impurities on the inner wall of the material suction gun pipe have an attractive force with the magnet pipe, when the material suction gun pipe is separated from the magnet pipe, the iron impurities on the inner wall of the material suction gun pipe can be moved out of the inner wall of the material suction gun pipe, wherein the annular receiving cavity extending in the vertical direction formed on the lower end face of the magnet pipe can receive and suck the iron impurities moved out of the inner wall of the material suction gun pipe, and finally the receiving of the iron impurities can be completed.

[0022] When the material suction gun pipe needs to suck the plastic particles in the material barrel again, the lifting assembly is used to drive the material suction gun pipe to move downward, so that the material suction gun pipe enters the material barrel after passing through the magnet pipe, and the material suction of the material suction gun pipe can be conveniently realized.

[0023] The present application further provides that the lower end of the material suction gun pipe is provided with a necked end with a cross-sectional outer diameter smaller than the inner diameter of the upper end port of the magnet pipe.

[0024] By adopting the above technical scheme, the necked end with a cross-sectional outer diameter smaller than the inner diameter of the upper end port of the magnet pipe is arranged at the lower end of the material suction gun pipe, and the necked end can play a protective role to avoid the iron impurities in the annular receiving cavity being pushed into the material suction gun pipe again when the material suction gun pipe moves downward and passes into the magnet pipe again.

[0025] The present application further provides that the lifting assembly comprises a plastic pipe arranged between the material suction gun pipe and the material suction hose and extending in the vertical direction, a first connecting arm arranged on the side wall of the material barrel, a guide pipe arranged on the first connecting arm and through which the plastic pipe passes, a connecting rod arranged between the first connecting arm and the guide pipe, a guide hole extending in the vertical direction and formed on the guide pipe, a first guide column arranged on the side wall of the plastic pipe and passing through the guide hole, a second connecting arm arranged on the lower side of the connecting table, a swing arm rotatingly connected to the lower end of the second connecting arm at the corner and in the shape of V, a first long slot formed on one end of the swing arm and through which the first guide column passes, a second long slot formed on the end of the swing arm away from the first long slot, and a second guide column arranged on the piston rod of the driving cylinder and passing through the second long slot.

[0026] By adopting the above technical scheme, when the feeding in the feeding hopper and the dust suction in the discharging pipe, the driving cylinder keeps the air blowing fan in the state of being docked with the collecting pipe, at this time, the piston rod of the driving cylinder is in the retracted state, the second guide column at the end of the piston rod of the driving cylinder drives the swing arm, so that one end of the second long slot hole on the swing arm is located on the side close to the driving cylinder, at this time, one end of the first long slot hole on the swing arm is swung downward to push the plastic pipe in the guide pipe downward, finally, the material suction gun pipe can pass through the magnet pipe and enter the hopper; at this time, since the end of the material suction gun pipe is embedded in the plastic particles, during the dust suction in the discharging pipe, due to the sealing effect of the plastic particles, the air flow entering the material suction bin from the material suction gun pipe is relatively small, most of the air flow enters from the exhaust pipe of the material suction fan in the shutdown state, finally, the impurities still attached to the filter screen can be better backflushed;

[0027] When the impurities are collected and the driving cylinder is needed to push the air blowing fan to make the air blowing fan docked with the blowing pipe, the piston rod of the driving cylinder is in the extended state, at this time, the second guide column at the end of the piston rod of the driving cylinder drives the swing arm, so that one end of the second long slot hole on the swing arm is located on the side away from the driving cylinder, at this time, one end of the first long slot hole on the swing arm is swung upward to push the plastic pipe in the guide pipe upward, finally, the material suction gun pipe can be pushed upward to leave the hopper, and the annular receiving cavity of the magnet pipe can receive and suck the iron impurities moved out from the inner wall of the material suction gun pipe, so that the collection of the iron impurities is completed.

[0028] The beneficial effects of the present application are: when the plastic particles need to be put into the feeding hopper, the second electromagnetic valve and the material suction fan are opened, and the first electromagnetic valve and the third electromagnetic valve are closed, after the material suction fan provides suction to the material suction hose, the material suction gun pipe can suck the plastic particles from the hopper into the material suction bin, and the suction of the plastic particles entering the material suction bin is reduced, so that the plastic particles fall into the feeding hopper under the action of their own gravity, the impurities in the plastic particles are adsorbed on the filter screen due to their light weight, at this time, the plastic particles entering the feeding hopper can be filtered;

[0029] When the plastic particles in the feeding hopper are finished, the second electromagnetic valve and the suction fan are closed first, and the third electromagnetic valve is opened, so that the impurities on the filter screen fall into the dropping pipe under the action of gravity, wherein the driving cylinder drives the blowing fan to move, so that the blowing fan is connected with the receiving pipe, and then the blowing fan is started, and the blowing fan can use the suction hose and the dust collection pipe to suck the dropping pipe, and the external airflow enters from the exhaust pipe of the stopped suction fan, at this time, the external airflow needs to pass through the filter screen, so that the impurities still attached to the filter screen are blown, which is conducive to the impurities being blown off and then sucked into the suction hose, and finally the impurities can pass through the suction hose and enter the filter collection bag for collection, so that the impurities are collected efficiently.

[0030] When the impurities are collected, the driving cylinder pushes the blowing fan, so that the blowing fan is connected with the blowing pipe, the first electromagnetic valve is opened, and the blowing fan sprays air flow into the lower end of the feeding hopper through the blowing pipe, so that the plastic particles in the lower end of the feeding hopper are disturbed, and finally the plastic particles in the lower end of the feeding hopper can fall smoothly, avoiding the situation that the plastic particles are blocked.

[0031] When the feeding hopper is feeding and the dropping pipe is sucking dust, the driving cylinder keeps the blowing fan connected with the collecting pipe, at this time, the piston rod of the driving cylinder is in the retracted state, the second guide column at the end of the driving cylinder piston rod drives the swing arm, so that one end of the second long slot on the swing arm is located near the driving cylinder, at this time, one end of the first long slot on the swing arm is swung downward to push the plastic pipe in the guide pipe downward, so that the suction gun pipe passes through the magnet pipe and enters the bucket; At this time, since the end of the suction gun pipe is embedded in the plastic particles, during the dust collection in the dropping pipe, the airflow entering the suction chamber from the suction gun pipe is relatively small, most of the airflow enters from the exhaust pipe of the stopped suction fan, and finally the impurities still attached to the filter screen are blown better.

[0032] When the impurities are collected and the driving cylinder is used to push the blowing fan to connect the blowing pipe, the piston rod of the driving cylinder is in the extended state, at this time, the second guide column at the end of the driving cylinder piston rod drives the swing arm, so that one end of the second long slot on the swing arm is located away from the driving cylinder, at this time, one end of the first long slot on the swing arm is swung upward to push the plastic pipe in the guide pipe upward, so that the suction gun pipe is lifted away from the bucket, and the annular receiving cavity of the magnet pipe can receive the iron impurities moved out from the inner wall of the suction gun pipe, so as to complete the collection of the iron impurities. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0034] Figure 1 is a structural plan view of the present application;

[0035] Figure 2 is a partial enlarged view of the connection relationship between the connecting table, the blowing fan, the driving cylinder and the lifting assembly in the present application;

[0036] Figure 3 is a structural sectional view of the magnet pipe in the present application;

[0037] Figure 4 is a plan view of the connection relationship between the connecting table, the blowing fan, the driving cylinder and the lifting assembly in the present application, which is in the process of feeding in the feeding hopper and dust collection in the falling pipe, the driving cylinder keeps the blowing fan in the state of being butted against the collecting pipe, and the swing arm swings downward to make the material suction gun pipe pass through the magnet pipe and enter the material bucket;

[0038] Figure 5 is a plan view of the connection relationship between the connecting table, the blowing fan, the driving cylinder and the lifting assembly in the present application, which is in the process of feeding in the feeding hopper and dust collection in the falling pipe, the driving cylinder keeps the blowing fan in the state of being butted against the collecting pipe, and the swing arm swings downward to make the material suction gun pipe pass through the magnet pipe and enter the material bucket;

[0039] In the drawings, 1 is a feeding hopper; 11 is a first electromagnetic valve; 2 is a material bucket; 3 is a material suction assembly; 31 is a material suction bin; 32 is a falling pipe; 321 is a second electromagnetic valve; 322 is a dust collection pipe; 3221 is a third electromagnetic valve; 33 is a material suction fan; 34 is a filter screen; 35 is an exhaust pipe; 36 is a material suction hose; 37 is a material suction gun pipe; 371 is a necked end; 4 is a connecting table; 41 is a blowing pipe; 42 is a blowing fan; 421 is a suction hose; 43 is a collecting pipe; 431 is a filter collecting cloth bag; 44 is a driving cylinder; 45 is an arc-shaped positioning plate; 5 is a magnet pipe; 51 is an annular receiving cavity; 6 is a lifting assembly; 61 is a plastic pipe; 62 is a first connecting arm; 63 is a guide pipe; 64 is a connecting rod; 65 is a guide hole; 66 is a first guide column; 67 is a second connecting arm; 68 is a swing arm; 69 is a first long slot; 601 is a second long slot; and 602 is a second guide column. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] A feed filter device for an injection molding machine, as described in the following description. Figure 1 The injection molding machine feeding and filtering device includes a feeding hopper 1 located on the injection molding machine for feeding plastic granules, and a material bucket 2 located on the ground below the feeding hopper 1 for feeding plastic granules. A first solenoid valve 11 is installed at the lower end of the feeding hopper 1, which controls the opening and closing of the lower end of the feeding hopper 1 to facilitate feeding the injection molding machine. At the same time, a suction assembly 3 is provided at the upper end of the feeding hopper 1. The suction assembly 3 includes a suction chamber 31, a discharge pipe 32, a suction fan 33, a filter screen 34, an exhaust pipe 35, a suction hose 36, and a suction gun pipe 37. The suction chamber 31 is located at the upper end of the feeding hopper 1, and the upper end of the discharge pipe 32 is welded to the lower side of the suction chamber 31, and the lower end is fixed to the upper end of the feeding hopper 1 by bolts. The discharge pipe 32 communicates with the inside of the feeding hopper 1, and a second solenoid valve 321 is installed at the lower end of the discharge pipe 32.

[0042] Reference Figure 1 The suction fan 33 is bolted to the upper end of the suction bin 31, and the suction port of the suction fan 33 is located inside the suction bin 31. The filter screen 34 is bolted to the upper end of the suction bin 31 and is located below the suction port of the suction fan 33. The exhaust pipe 35 is welded to the suction fan 33 and provides exhaust air for the suction fan 33 during operation. At the same time, the suction hose 36 is connected at one end to the suction bin 31 located below the filter screen 34. The suction fan 33 provides suction to the suction hose 36 during operation. The suction gun pipe 37 is located at the end of the suction hose 36 away from the suction bin 31 and is used to extend into the material bucket 2.

[0043] Reference Figure 1 , Figure 2The side wall of the feeding hopper 1 is bolted with a connecting table 4, and the connecting table 4 is provided with a blowing fan 42. The feeding hopper 1 is provided with a blowing pipe 41, the lower end of the blowing pipe 41 is communicated with the lower end of the feeding hopper 1, and the upper end is connected with the connecting table 4. The blowing fan 42 is connected with the end of the blowing pipe 41 on the connecting table 4, so that the blowing fan 42 and the blowing pipe 41 blow air flow into the feeding hopper 1. Meanwhile, the connecting table 4 is welded with a collecting pipe 43 on the side away from the blowing pipe 41, and the lower end of the collecting pipe 43 is connected with a filter collecting bag 431 through a clamp. The connecting table 4 is welded with an arc-shaped positioning plate 45 on the side away from the blowing pipe 41 and the collecting pipe 43. The arc-shaped positioning plate 45 is used for abutting the outlet end of the blowing fan 42.

[0044] Referring to Figure 1 、 Figure 2 The blowing fan 42 is provided with a suction hose 421 connected with the inlet end of the blowing fan 42 through a bolt. The upper end of the dropping pipe 32 is welded with a dust suction pipe 322 connected with the end of the suction hose 421 away from the blowing fan 42 through a clamp. The lower end of the dust suction pipe 322 is welded with the dropping pipe 32, and the upper end extends upwardly and obliquely. The dust suction pipe 322 is provided with a third electromagnetic valve 3221. The connecting table 4 is bolted with a driving cylinder 44. The piston rod end of the driving cylinder 44 is bolted with the blowing fan 42. The driving cylinder 44 drives the blowing fan 42 to move back and forth, so that the outlet end of the blowing fan 42 is connected with the blowing pipe 41 or the collecting pipe 43.

[0045] Referring to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5The middle position of the material bucket 2 is also provided with a magnet pipe 5 fixed by bolts, the lower end of the magnet pipe 5 is spaced from the bottom wall of the material bucket 2, the magnet pipe 5 is used for the suction gun pipe 37 to pass through and is used for attracting the iron impurities in the plastic particles to the inner wall of the suction gun pipe 37, the lower end surface of the magnet pipe 5 is provided with an annular receiving cavity 51, the annular receiving cavity 51 extends in the vertical direction and is used for receiving the iron impurities, and the lower end of the suction gun pipe 37 is integrally provided with a necked end 371 with a smaller cross-sectional outer diameter than the inner diameter of the upper end of the magnet pipe 5; the connecting table 4 is also provided with a lifting assembly 6 for driving the suction gun pipe 37 to move up and down and in and out of the magnet pipe 5, the lifting assembly 6 comprises a plastic pipe 61, a first connecting arm 62, a guide pipe 63, a connecting rod 64, a guide hole 65, a first guide column 66, a second connecting arm 67, a swing arm 68, a first long slot 69, a second long slot 601, and a second guide column 602, wherein the plastic pipe 61 is located between the suction gun pipe 37 and the suction hose 36, the two ends of the plastic pipe 61 are adhesively fixed with the suction gun pipe 37 and the suction hose 36, the plastic pipe 61 extends in the vertical direction, the first connecting arm 62 is welded on the side wall of the material bucket 2, the guide pipe 63 is provided on the first connecting arm 62 and passes through the plastic pipe 61, one end of the connecting rod 64 is welded on the first connecting arm 62 and the other end is welded on the outer wall of the guide pipe 63, the guide hole 65 is provided on the guide pipe 63 and extends in the vertical direction, the first guide column 66 is welded on the side wall of the plastic pipe 61 and passes through the guide hole 65, the second connecting arm 67 is welded on the lower side of the connecting table 4, the swing arm 68 is V-shaped, the swing arm 68 is rotationally connected to the lower end of the second connecting arm 67 through a shaft and a bearing, the first long slot 69 is provided at one end of the swing arm 68 and passes through the first guide column 66, and the second long slot 601 is provided at the end of the swing arm 68 away from the first long slot 69, wherein the second guide column 602 is welded on the piston rod of the driving cylinder 44 and passes through the second long slot 601, and the first guide column 66 and the second guide column 602 are both rotationally connected with guide wheels.

[0046] Principle: when the plastic particles need to be put into the feeding hopper 1, the second electromagnetic valve 321 and the suction fan 33 are opened, and the first electromagnetic valve 11 and the third electromagnetic valve 3221 are closed, the suction fan 33 provides suction to the suction hose 36, and the suction gun pipe 37 can suck the plastic particles from the material bucket 2 into the suction bin 31, the suction force received by the plastic particles entering the suction bin 31 is reduced, so the plastic particles fall into the feeding hopper 1 under the action of their own gravity, the impurities in the plastic particles are adsorbed on the filter screen 34 due to their light weight, at this time, the plastic particles entering the feeding hopper 1 can be filtered.

[0047] When the plastic particles in the feeding hopper 1 are finished, the second electromagnetic valve 321 and the suction fan 33 are closed first, and the third electromagnetic valve 3221 is opened, so that the impurities on the filter screen 34 fall into the dropping pipe 32 under the action of gravity, and the blowing fan 42 is moved by the driving cylinder 44 to connect the receiving pipe 43, and then the blowing fan 42 is started to suck the dropping pipe 32 by the suction hose 421 and the dust collection pipe 322, and the external airflow enters from the exhaust pipe 35 of the stopped suction fan 33, which needs to pass through the filter screen 34 to blow the impurities still attached to the filter screen 34, so that the impurities are blown off and sucked into the suction hose 421, and finally the impurities enter the filter collection bag 431 to be collected, thereby realizing efficient collection of impurities.

[0048] When the impurities are collected, the blowing fan 42 is pushed by the driving cylinder 44 to connect the blowing pipe 41, the first electromagnetic valve 11 is opened, and the blowing fan 42 sprays air flow through the blowing pipe 41 towards the lower end of the feeding hopper 1, which can disturb the plastic particles in the lower end of the feeding hopper 1, and finally the plastic particles in the lower end of the feeding hopper 1 can fall smoothly to avoid blockage.

[0049] During the feeding process in the feeding hopper 1 and the dust collection process in the dropping pipe 32, the driving cylinder 44 keeps the blowing fan 42 connected to the receiving pipe 43, and the piston rod of the driving cylinder 44 is in a retracted state, the second guide column 602 at the end of the piston rod of the driving cylinder 44 drives the swing arm 68, so that one end of the second long hole 601 on the swing arm 68 is located near the driving cylinder 44, and one end of the first long hole 69 on the swing arm 68 is pushed down in the plastic pipe 61 in the guide pipe 63, so that the suction gun pipe 37 enters the bucket 2 through the magnet pipe 5; During the dust collection process in the dropping pipe 32, the airflow entering the suction chamber 31 from the suction gun pipe 37 is less due to the sealing effect of the plastic particles, and most of the airflow enters from the exhaust pipe 35 of the stopped suction fan 33, which can better blow the impurities still attached to the filter screen 34.

[0050] When the impurities are collected and the blowing fan 42 needs to be pushed by the driving cylinder 44 to be connected with the blowing pipe 41, the piston rod of the driving cylinder 44 is in the extended state, at this time, the second guide column 602 at the end of the piston rod of the driving cylinder 44 drives the swing arm 68, so that one end of the second long hole 601 on the swing arm 68 is located on the side away from the driving cylinder 44, at this time, one end of the first long hole 69 on the swing arm 68 is swung upward to push the plastic pipe 61 in the guide pipe 63 upward, finally the suction gun pipe 37 can be moved upward to leave the barrel 2, and the annular receiving cavity 51 of the magnet pipe 5 can receive the iron impurities from the inner wall of the suction gun pipe 37, so that the collection of the iron impurities is completed.

Claims

1. A feeding filter device for an injection molding machine, comprising a feeding hopper (1) located on the injection molding machine for receiving plastic granular material, and a material bucket (2) located on the ground below the feeding hopper (1) for pouring in the plastic granules, characterized in that: The lower end of the feed hopper (1) is provided with a first solenoid valve (11), and the upper end of the feed hopper (1) is provided with a suction assembly (3). The suction assembly (3) includes a suction chamber (31) at the upper end of the feed hopper (1), a discharge pipe (32) located at the lower end of the suction chamber (31) and communicating with the inside of the feed hopper (1), a suction fan (33) at the upper end of the suction chamber (31), a filter screen (34) located at the upper end of the suction chamber (31) and below the suction port of the suction fan (33), an exhaust pipe (35) on the suction fan (33), and one end connected to the suction chamber (31) located below the filter screen (34). The suction hose (36) and the suction gun pipe (37) are located at the end of the suction hose (36) away from the suction bin (31) and are used to extend into the material bucket (2); the feed hopper (1) is provided with a blower pipe (41) whose lower end is connected to the lower end of the feed hopper (1), and the upper end of the blower pipe (41) is provided with a blower (42) whose air outlet is connected to the upper end of the blower pipe (41). The side wall of the feed hopper (1) is provided with a connecting platform (4) for connecting the blower (42); the lower end of the discharge pipe (32) is provided with a second solenoid valve (321), and the connecting platform (4) is located on one side of the blower pipe (41). A collection pipe (43) is provided, and a filter collection bag (431) is provided at the lower end of the collection pipe (43). A suction hose (421) is provided on the blower (42) with one end connected to the air inlet end of the blower (42). A dust suction pipe (322) is provided at the upper end of the discharge pipe (32) and connected to the end of the suction hose (421) away from the blower (42). A drive cylinder (44) is provided on the connecting platform (4) with the piston rod end connected to the blower (42) and used to drive the blower (42) to move back and forth so that the air outlet end of the blower (42) connects to the blower pipe (41) or the collection pipe (43). The suction pipe (322) is equipped with a third solenoid valve (3221); the lower end of the suction pipe (322) is connected to the discharge pipe (32) and the upper end extends upward at an angle; a magnetic tube (5) is provided in the middle of the material barrel (2) for the suction gun pipe (37) to pass through and for attracting iron impurities in the plastic particles to the inner wall of the suction gun pipe (37); an annular receiving cavity (51) extending vertically and for collecting iron impurities is provided on the lower end surface of the magnetic tube (5); a lifting assembly (6) is provided on the connecting platform (4) for moving the suction gun pipe (37) up and down and entering and exiting the magnetic tube (5).The lifting assembly (6) includes a plastic tube (61) extending vertically between the suction gun tube (37) and the suction hose (36), a first connecting arm (62) on the side wall of the material tank (2), a guide tube (63) on the first connecting arm (62) through which the plastic tube (61) passes, a connecting rod (64) between the first connecting arm (62) and the guide tube (63), a guide hole (65) on the guide tube (63) extending vertically, and a guide hole on the side wall of the plastic tube (61) through the guide hole. (65) A first guide post (66), a second connecting arm (67) located on the lower side of the connecting platform (4), a V-shaped swing arm (68) rotatably connected to the lower end of the second connecting arm (67) at the bend, a first elongated hole (69) opened at one end of the swing arm (68) for the first guide post (66) to pass through, a second elongated hole (601) opened at the end of the swing arm (68) away from the first elongated hole (69), and a second guide post (602) located on the piston rod of the drive cylinder (44) and passing through the second elongated hole (601).

2. The injection molding machine feed filter device according to claim 1, characterized in that: An arc-shaped positioning plate (45) is provided on the connecting platform (4) on the side where the blow pipe (41) and the collection pipe (43) are far apart from each other.

3. The injection molding machine feed filter device according to claim 1, characterized in that: The lower end of the suction gun tube (37) is provided with a constricted end (371) whose cross-sectional outer diameter is smaller than the inner diameter of the upper end of the magnet tube (5).

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