Metal separation equipment and plastic particle flow rate control method

Abstract

The present invention relates to the technical field of metal separators, and in particular to a method for controlling the flow rate of plastic particles in a metal separation device. The metal separation device comprises a box body, a shell, an inner liner, a plurality of partitions, a plurality of closing components, a sensing part, a plurality of distribution pipes and a control module. The interior of the box body is hollow, and a feed pipe and a discharge pipe connected to the interior of the box body are respectively arranged on opposite sides. The metal separation device arranges a plurality of partitions between the shell and the inner tank to divide the feeding channel between the shell and the inner tank into a plurality of feeding channels, thereby diverting the plastic pellets entering the shell to each feeding channel, so that after the receiving component detects that the plastic pellets are mixed with metal impurities, it only needs to discharge a small amount of plastic pellets to discharge the metal impurities together, thereby improving the accuracy of removing metal impurities and reducing the discharge amount of unnecessary plastic pellets, and also providing convenience for the separation and recovery of the discharged plastic pellets mixed with metal impurities. The present invention relates to the technical field of metal separators, and in particular to a method for controlling the flow rate of plastic pellets in a metal separation device, the metal separation device comprising a box body, a shell, an inner tank, a plurality of partitions, a plurality of closing components, a sensing part, a plurality of distribution pipes and a control module, the interior of the box body is hollow, and a feed pipe and a discharge pipe connected to the interior of the box body are respectively arranged on opposite sides. The metal separation device arranges a plurality of partitions between the shell and the inner liner to divide the feeding channel between the shell and the inner liner into a plurality of feeding channels, thereby diverting the plastic pellets entering the shell to each feeding channel, so that after the receiving component detects that metal impurities are mixed in the plastic pellets, it only needs to discharge a small amount of plastic pellets to discharge the metal impurities together, thereby improving the accuracy of removing metal impurities and reducing the amount of unnecessary plastic pellets discharged, and also providing convenience for the separation and recovery of the discharged plastic pellets mixed with metal impurities.

Description

Technical Field

[0001] The invention relates to metal separation equipment, in particular to metal separation equipment and a method for controlling the flow rate of plastic particles. Background Art

[0002] Metal separators in the prior art are widely used in industries such as plastic injection molding to separate and remove metal impurities in feed materials, protect mechanical equipment and improve product quality. However, the existing metal separator design has some significant defects, which are mainly due to its structural design, especially when separating metal impurities.

[0003] The design of traditional metal separators needs to consider the coordinated arrangement of the transmitting coil and the receiving coil, which results in traditional metal separators often having only one discharge port that can be used to separate metal impurities. This structural design is not sufficient to achieve more sophisticated material processing. Therefore, after detecting metal impurities, it often leads to a single discharge volume of plastic particles mixed with metal impurities that is too large, and the efficiency of removing metal impurities is low. In addition, the unnecessary discharge of a large number of plastic particles makes the sorting and reuse work in subsequent processing steps more difficult and complicated, increases the burden of subsequent screening and separation work, and reduces the efficiency and cost-effectiveness of the entire production process. Summary of the invention

[0004] The purpose of the present invention is to provide a metal separation device and a method for controlling the flow rate of plastic particles, so as to solve the problem that in traditional metal separators, due to the limited arrangement of the transmitting coil and the receiving coil, only a single discharge port can be set, resulting in unnecessary discharge of a large number of plastic particles.

[0005] The technical solution adopted by the present invention to solve the above problems is: a metal separation device, comprising:

[0006] The box body has a feeding pipe and a discharging pipe respectively arranged on opposite sides of the box body, and a plurality of material distribution ports are constructed on the box body.

[0007] A shell, wherein a first accommodating space is constructed inside the shell, and a feed port and a discharge port are respectively provided at opposite ends of the shell, and the shell is arranged inside the box body so that the feed port is connected to the feed pipe, and the discharge port is connected to the discharge pipe, and a plurality of accommodating grooves and a plurality of discharge ports are constructed on the surrounding side of the first accommodating space, each of the accommodating grooves is arranged close to the feed port, and each of the discharge ports is arranged close to the discharge port.

[0008] The inner liner is arranged in the first accommodating space, the gap between the outer surface of the inner liner and the inner wall of the first accommodating space constitutes a feeding channel, and the interior of the inner liner is configured with a second accommodating space.

[0009] A plurality of baffles are arranged in the feeding channel in a circular array to divide the feeding channel into a plurality of independent feeding channels, one end of the feeding channel is arranged near the feeding port, and the other end of the feeding channel is arranged near the discharging port, each of the feeding channels is connected with each of the accommodating grooves in a one-to-one correspondence, and each of the feeding channels is connected with each of the discharging ports in a one-to-one correspondence.

[0010] The induction part includes a transmitting component and a plurality of receiving components, the transmitting component generates a magnetic field in a controlled manner, the transmitting component is arranged in the second accommodating space, and each of the receiving components is arranged in each of the accommodating grooves in a one-to-one manner, and the magnetic field generated by the transmitting component can pass through each of the receiving components at the same time.

[0011] A plurality of material distribution pipes are connected to the plurality of discharge ports in a one-to-one correspondence, and one end of each material distribution pipe that is away from the shell body passes through the plurality of material distribution ports in a one-to-one correspondence to extend to the outside of the shell body.

[0012] A plurality of closing components, each of which is arranged at each of the discharge ports in a one-to-one correspondence, and the closing components are configured to have a first state and a second state. When the closing component is in the first state, the discharge port corresponding to the closing component is closed so that the corresponding feeding channel is in a passage state. When the closing component is in the second state, the feeding channel corresponding to the closing component is blocked so that the corresponding discharge port is in a passage state.

[0013] A control module, wherein the control module is connected to the sensing part to receive the magnetic field change signal of each receiving component, and the control module is connected to each closing component, and the control module is configured to: when the magnetic field change exceeds a preset value, switch the corresponding closing component to the second state, and when the magnetic field change is lower than a preset value, switch the corresponding closing component to the first state.

[0014] Preferably, the inner wall of the first accommodating space and the side of the inner container facing the first accommodating space are both curved surfaces, and the centers of circles corresponding to the two curved surfaces coincide with each other.

[0015] Preferably, the two opposite sides of the two partitions for enclosing the feeding channel are constructed with a plurality of curved protrusions to limit the width of the feeding channel, and along the feeding direction of the feeding channel, the curved protrusions are distributed between the accommodating groove and the discharge port.

[0016] Preferably, a filling groove is provided between each adjacent feeding channel, and the filling groove is filled with electromagnetic shielding material.

[0017] Preferably, a plurality of through grooves are constructed on the inner liner, and the positions of the through grooves correspond to the positions of the receiving grooves one by one, so that the magnetic field generated by the transmitting coil can be transmitted to the receiving coil located in the corresponding receiving groove through the corresponding through grooves, and a plastic sheet is installed in each of the through grooves, and the side of each of the plastic sheets facing the shell is flush with the outer surface of the inner liner.

[0018] Preferably, one end of the inner container close to the feed inlet is constructed as a curved surface.

[0019] Preferably, the transmitting component is a transmitting coil, and each of the receiving components is a receiving coil. A rod is arranged at the center of the second accommodating space, and the extending direction of the rod is the same as the direction in which the feed port points to the discharge port. The transmitting coil is fixedly sleeved on the outside of the rod, and the transmitting coil and each of the receiving coils are arranged at the same horizontal height.

[0020] Preferably, each of the feeding channels is provided with a flow regulating member for adjusting the port size at one end close to the feeding port.

[0021] In particular, a method for controlling the flow rate of plastic particles in a feeding channel of a metal separation device:

[0022] Determine the minimum distance d between the metal impurities in the feeding channel and the closing component when the interference caused by the metal impurities on the magnetic field of the receiving coil exceeds a preset value.

[0023] A response time Δt for the closing component to switch from the first state to the second state when the receiving coil corresponding to the feeding channel senses metal impurities is determined.

[0024] Determine the maximum average flow velocity μ of the metal impurities in the feeding channel according to the minimum distance d and the response time Δt max .

[0025] The width w of the feeding channel, the curvature R of the feeding channel, the thickness h of the feeding channel and the number N of plastic particles per unit area at the cross section of the feeding channel are adjusted so that the average flow velocity of the metal impurities in the feeding channel is less than the maximum average flow velocity μ max .

[0026] Preferably, the width w of the feeding channel, the curvature R of the feeding channel, the thickness h of the feeding channel and the number N of plastic particles per unit area at the cross section of the feeding channel are adjusted so that the average flow velocity of the metal impurities in the feeding channel is less than the maximum average flow velocity μ max , further, it can be shown by the following formula:

[0027]

[0028] Among them, K, α, β and γ are all empirical coefficient values.

[0029] g is the acceleration due to gravity.

[0030] μ is the average flow velocity of the metal impurities in the feed channel.

[0031] R is the curvature of the feeding channel, and the curvature of the feeding channel is equal to the curvature corresponding to the outer curved surface of the inner liner.

[0032] w is the width of the feeding channel, and the width of the feeding channel is equal to the distance between the two opposite sides of the adjacent partitions.

[0033] h is the thickness of the feeding channel, and the thickness of the feeding channel is equal to the distance from the outer surface of the liner to the inner wall of the first accommodating space.

[0034] Beneficial Effects

[0035] The metal separation device arranges a plurality of partitions between the shell and the inner liner to divide the feeding channel between the shell and the inner liner into a plurality of feeding channels, thereby diverting the plastic pellets entering the shell to each feeding channel, so that after the receiving component detects that metal impurities are mixed in the plastic pellets, it only needs to discharge a small amount of plastic pellets to discharge the metal impurities together, thereby improving the accuracy of removing metal impurities and reducing the amount of unnecessary plastic pellets discharged, and also providing convenience for the separation and recovery of the discharged plastic pellets mixed with metal impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 2 is a front view of an embodiment of the present invention.

[0037] Figure 2 2 is a bottom view of an embodiment of the present invention.

[0038] Figure 3 It is a schematic structural diagram of a separation tube and a shell in a connected state in an embodiment of the present invention.

[0039] Figure 4 It is a front cross-sectional view of an embodiment of the present invention.

[0040] Figure 5 is an exploded view of an embodiment of the present invention.

[0041] Figure 6 It is a schematic structural diagram of the plastic sheet and the through groove in the embodiment of the present invention when they are separated.

[0042] Among them: 1. Box body; 110. Feed pipe; 120. Discharge pipe; 130. Distributing port; 2. Shell; 210. First accommodating space; 220. Feed port; 230. Discharge port; 240. Accommodating slot; 250. Discharging port; 3. Inner liner; 310. Second accommodating space; 311. Rod; 320. Feed channel; 330. Filling slot; 340. Through slot; 350. Plastic sheet; 4. Partition; 5. Closing component; 6. Induction unit; 610. Transmitting component; 620. Receiving component; 7. Distributing pipe; 8. Flow regulating component. DETAILED DESCRIPTION

[0043] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description created by the present application, unless otherwise specified, "multiple" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0046] like Figure 1-5As shown. A metal separation device in a preferred embodiment of the present application includes a box body 1, a shell 2, an inner tank 3, a plurality of partitions 4, a plurality of closing components 5, a sensing part 6, a plurality of material distribution pipes 7 and a control module (not shown in the figure). The interior of the box body 1 is hollow, and a feed pipe 110 and a discharge pipe 120 connected to the interior of the box body 1 are respectively arranged on opposite sides thereof, and a plurality of material distribution ports 130 are also arranged on the side of the box body 1 where the discharge pipe 120 is arranged. The shell 2 is arranged inside the box body 1, and the shell 2 has a first accommodation space 210 therein. The opposite ends of the shell 2 are provided with a feed port 220 and a discharge port 230, respectively. The feed port 220 is connected to the feed pipe 110, and the discharge port 230 is connected to the discharge pipe 120. The first accommodation space 210 is provided with a plurality of accommodation grooves 240 and a plurality of discharge ports 250 on the periphery thereof. The plurality of accommodation grooves 240 are arranged close to the feed port 220, and the plurality of discharge ports 250 are arranged close to the discharge port 230. The liner 3 is arranged inside the first accommodation space 210, and the liner 3 has a second accommodation space 310 therein. The gap between the outer surface of the liner 3 and the inner wall of the first accommodation space 210 constitutes a feeding channel. A plurality of partitions 4 surround the outer surface of the inner liner 3 in an equidistant annular array and are arranged in the feeding channel. Each partition 4 is respectively sealed and connected to the outer surface of the inner liner 3 and the inner wall of the first accommodating space 210 on both sides thereof, so as to separate the feeding channel into a plurality of independent feeding channels 320. The feeding channels 320 are formed by the opposite sides of the adjacent partitions 4 cooperating with the inner wall of the first accommodating space 210 and the outer surface of the inner liner 3. Each of the closing components 5 is arranged at each of the discharge ports 250 in a one-to-one correspondence manner. The closing components 5 are configured to have a first state and a second state. When the closing components 5 are in the first state, the discharge port 250 corresponding to the closing components 5 is closed, so that the corresponding feeding channel 320 is in a passage state. When the closing components 5 are in the second state, the feeding channel 320 corresponding to the closing components 5 is blocked, so that the corresponding discharge port 250 is in a passage state. The induction part 6 includes a transmitting component 610 and a plurality of receiving components 620. The transmitting component 610 generates a magnetic field in a controlled manner. The transmitting component 610 is arranged at the center of the second accommodating space 310. The transmitting component 610 is arranged close to the feed port 220. Each of the receiving components 620 is arranged in each of the accommodating grooves 240 in a one-to-one correspondence, and the magnetic field generated by the transmitting component 610 can pass through each of the receiving components 620 at the same time. The plurality of the distribution pipes 7 are connected to the plurality of the discharge ports 250 in a one-to-one correspondence, and the end of each of the distribution pipes 7 that faces away from the shell 2 passes through the plurality of the distribution ports 130 in a one-to-one correspondence to extend to the outside of the shell 2.The control module is connected to the sensing part 6 to receive the magnetic field change signal of each receiving component 620, and the control module is connected to each closing component 5. The control module is configured to: when the magnetic field change exceeds the preset value, switch the corresponding closing component 5 to the second state, and when the magnetic field change is lower than the preset value, switch the corresponding closing component 5 to the first state. The metal separation device in this embodiment is arranged between the shell 2 and the inner liner 3 by arranging a plurality of partitions 4 to separate the feeding channel between the shell 2 and the inner liner 3 into a plurality of feeding channels 320, so that the plastic particles entering the shell 2 are diverted to each feeding channel 320, so that after the receiving component 620 detects that the plastic particles are mixed with metal impurities, it only needs to discharge a small amount of plastic particles to discharge the metal impurities, which improves the accuracy of removing metal impurities and reduces the discharge amount of plastic particles, and also provides convenience for the recovery and impurity removal of the discharged plastic particles.

[0047] Specifically, the box body 1 is formed by splicing four side surfaces, a top surface and a bottom surface, and the four side surfaces, a top surface and a bottom surface enclose the internal space of the box body 1, and the feed pipe 110 and the discharge pipe 120 are respectively arranged on the top surface and the bottom surface. The inner wall of the first accommodating space 210 and the side of the inner liner 3 facing the first accommodating space 210 are both curved surfaces, the centers of the two curved surfaces coincide, and the end of the inner liner 3 close to the feed port 220 is also constructed as a curved surface. Therefore, the shape of the shell 2 and the inner liner 3 can preferably be approximately an ellipsoid, and the shape of the outer surface of the inner liner 3 is approximately formed by the equidistant inner wall of the shell 2. Therefore, in the part constituting the feeding channel, the shortest distance from any point on the shell 2 to the surface of the inner liner 3 is equal, and the centers of the two curved surfaces coincide. The feed port 220 and the discharge port 230 are respectively distributed at both ends of the corresponding major axis of the ellipsoid to realize the feeding and discharging of plastic particles. The partition 4 includes two mutually parallel planes, two mutually parallel arc surfaces and sections respectively located at both ends along the length direction of the partition 4, wherein the arc surface with a larger radius among the two parallel arc surfaces is connected to the inner surface of the shell 2, i.e., the inner wall of the first accommodating space 210, and the arc surface with a smaller radius among the two parallel arc surfaces is connected to the outer side surface of the liner 3, and the connection modes of the two arc surfaces to the inner surface of the shell 2 and the outer side surface of the liner 3 are both sealed connections. The closing assembly 5 includes a closing plate and a driving member (not shown in the figure) for controlling the rotation of the closing plate, each closing plate is hingedly mounted on each discharge port 250, and the shape and size of the closing plate are configured so that when the closing plate is fitted with the shell 2, the closing plate can block the discharge port 250, and a sealing pad layer is also provided on the closing plate on the side facing the shell 2 to fill the gap between the closing plate and the shell 2 after the two are fitted, and the driving member can preferably be a controlled telescopic telescopic rod. The transmitting component 610 is preferably a transmitting coil, and the receiving component 620 is preferably a receiving coil. A rod 311 is arranged at the center of the second accommodating space 310. The extension direction of the rod 311 is the same as the direction in which the feed port 220 points to the discharge port 230. The transmitting coil is fixedly sleeved on the outside of the rod 311, and each receiving coil is respectively installed in each accommodating groove 240. There is only one receiving coil in each accommodating groove 240, and the transmitting coil and each receiving coil are arranged at the same horizontal height.When metal impurities pass through a certain feeding channel 320, the metal impurities will generate eddy currents (self-inductance currents) under the action of the magnetic field with constantly changing strength emitted by the transmitting coil, thereby forming a magnetic field. The magnetic field generated by the metal impurities will interfere with the magnetic field generated by the receiving coil in the corresponding feeding channel 320. When the magnetic field fluctuation of the receiving coil exceeds the preset value, it means that metal impurities have entered the feeding channel 320. At this time, the control module will send a control signal to the closing component 5 to drive the closing plate to flip, that is, to switch the closing component 5 from the first state to the second state, so as to discharge the plastic particles mixed with metal impurities. Afterwards, at a preset time after the fluctuation value of the receiving coil in the corresponding feeding channel 320 is lower than the preset value again, the control module will send a control signal to the closing component 5 again to switch the closing component 5 back to the first state to ensure that the plastic particles are smoothly delivered to the injection molding machine through the discharge pipe 120.

[0048] It should be noted that in order to ensure that the magnetic field generated by the transmitting coil can effectively pass through the receiving coils placed at different positions while maintaining sufficient uniformity and strength to accurately detect metal impurities, the transmitting coil can be designed as a ring-shaped or spiral coil layout so that the transmitting coil can generate a wide and uniform magnetic field, ensuring that the magnetic field is evenly distributed in the entire detection area, and by adjusting the position of the receiving coil, ensuring that all receiving coils are evenly distributed within the magnetic field range of the transmitting coil, and by adjusting their positions to maximize the magnetic field coverage effect. In addition, during the design stage, magnetic field simulation software (such as ANSYS Maxwell) can be used to predict the magnetic field distribution and conduct experimental verification to ensure the consistency between theory and practice.

[0049] In some embodiments, Figure 4-6 As shown, the housing 2 is formed by splicing two identical and hollow semi-ellipsoid structures, and flanges are arranged around the circumference of the joint of the two semi-ellipsoids, and the two flanges are connected by fasteners.

[0050] In some embodiments, Figure 4 As shown, one end of the inner container 3 near the discharge port 230 is sunken inward in a direction away from the discharge port 230 to expand the port area of ​​the feeding channel 320 near the discharge port 230, thereby ensuring that the plastic particles in each feeding channel 320 can fall smoothly.

[0051] In some embodiments, in order to shorten the flipping time of the closing plate, the mechanical part of the closing component 5 should be designed to quickly perform the opening and closing action. Common driving methods include electromagnets, pneumatic or hydraulic systems, so the driving member is preferably a pneumatic telescopic rod. When the control module (microcontroller or PLC system) processes the signal of the receiving coil in real time, if it is found that the magnetic field change of a certain receiving coil exceeds the preset value, the control module will quickly drive the closing component 5 to switch to the second state. The response time Δt of the pneumatic telescopic rod is usually less than 0.2s.

[0052] In some embodiments, Figure 5-6 In order to reduce the shielding effect of the inner liner 3 on the magnetic field, the material of the inner liner 3 can be a high-strength plastic part, or a plurality of through grooves 340 are constructed on the inner liner 3, and the position of each through groove 340 corresponds to the position of each accommodating groove 240, so that the magnetic field generated by the transmitting coil can be transmitted to the receiving coil located in the corresponding accommodating groove 240 through the corresponding through groove 340, and a plastic sheet 350 is installed in each of the through grooves 340, and the side of each of the plastic sheets 350 facing the shell 2 is flush with the outer surface of the inner liner 3 to avoid interference with the flow of plastic particles.

[0053] In some embodiments, Figure 5 A filling slot 330 is provided between each adjacent feeding channel 320 , and the filling slot 330 is filled with electromagnetic shielding material to reduce magnetic field interference between adjacent feeding channels 320 .

[0054] In one embodiment, Figure 1 and Figure 5 In order to avoid leakage, that is, metal impurities mixed in the plastic pellets are discharged from the discharge port 230 before the closing component 5 can be switched to the second state in time, a plurality of curved protrusions (not shown in the figure) can be constructed on the opposite sides of the two partitions 4 used to enclose the feeding channel 320 to change the feeding width of the feeding channel 320, thereby playing a role in extending the flow time of the plastic pellets in the feeding channel 320. It should be noted that along the feeding direction of the feeding channel 320, the curved protrusions are distributed between the accommodating groove 240 and the discharge port 250.

[0055] In another embodiment, in order to avoid leakage, the flow rate of metal impurities entering the feeding channel 320 needs to be controlled. Moreover, because the metal impurities (the size of the metal impurities is mostly between 0.1 mm and 0.5 mm) are mixed in the plastic particles, when the metal impurities are small enough, the flow rate of the plastic particles can be regarded as the flow rate of the metal impurities. Specifically, a method for controlling the flow rate of plastic particles in the feeding channel 320 in a metal separation device includes:

[0056] Determine the minimum distance d between the metal impurities in the feeding channel 320 and the closing component 5 when the interference caused by the metal impurities on the magnetic field of the receiving coil exceeds a preset value.

[0057] The response time Δt of the closing component 5 switching from the first state to the second state when the receiving coil corresponding to the feeding channel 320 senses metal impurities is determined.

[0058] Determine the maximum average flow velocity μ of the metal impurities in the feeding channel 320 according to the minimum distance d and the response time Δt max .

[0059] The width w of the feeding channel 320, the curvature R of the feeding channel 320, the thickness h of the feeding channel 320 and the number N of plastic particles per unit area at the cross section of the feeding channel 320 are adjusted so that the average flow rate of metal impurities in the feeding channel 320 is less than the maximum average flow rate μ max .

[0060] The width w of the feeding channel 320, the curvature R of the feeding channel 320, the thickness h of the feeding channel 320 and the number N of plastic particles per unit area at the cross section of the feeding channel 320 are adjusted so that the average flow rate of metal impurities in the feeding channel 320 is less than the maximum average flow rate μ max , further, it can be shown by the following formula:

[0061]

[0062] in:

[0063] K, α and β are all empirical coefficient values ​​and must be obtained by fitting experimental data.

[0064] g is the acceleration of gravity, μ is the average flow velocity of metal impurities in the feeding channel 320, R is the curvature of the feeding channel 320, which is equal to the curvature corresponding to the outer curved surface of the inner liner 3, w is the width of the feeding channel 320, which is equal to the distance between the opposite sides of the adjacent partitions 4, and h is the thickness of the feeding channel 320, which is equal to the distance from the outer surface of the inner liner 3 to the inner wall of the first accommodating space 210.

[0065] The curvature R of the feeding channel 320 , the width w of the feeding channel 320 , and the thickness h of the feeding channel 320 are combined to express that the plastic pellets in the feeding channel 320 are subject to the combined influence of geometrical restriction and gravity drive.

[0066] N γ It expresses the influence of the number N of plastic pellets in the feeding channel 320 on the flow rate. Generally, an increase in plastic pellets will reduce the flow rate. Here, γ is an index that characterizes the strength of this relationship.

[0067] It is understandable that K, α, β and γ all need to be obtained by implementing data fitting. Therefore, when designing an experiment, it is necessary to measure the flow rate of the plastic pellets in the feeding channel 320 under different parameter configurations, specifically including the following three situations:

[0068] (1) The width w and thickness h of the feeding channel 320 are changed while keeping the curvature R of the feeding channel 320 and the number N of plastic pellets in the feeding channel 320 unchanged.

[0069] (2) The number N of plastic pellets in the feeding channel 320 is changed to observe its effect on the flow rate.

[0070] (3) The curvature R of the feeding channel 320 is changed to investigate the effect of different curvatures on the flow rate of the plastic particles in the feeding channel 320.

[0071] After that, after completing the data collection, the values ​​of K, α, β and γ can be fitted through optimization algorithms such as regression analysis and least squares method.

[0072] It should be noted that, when performing numerical simulation, ANSYS Fluent or COMSOL Multiphusics can be used to simulate the flow of plastic pellets in the feeding channel 320 and predict the experimental results to reduce the number of actual experiments. MATLAB, Python, especially (SciPy and Pandas libraries), etc. can be used to further optimize the data and parameter memory.

[0073] Through the above steps, the design of the feed channel 320 can be systematically adjusted and optimized to achieve a desired plastic pellet flow rate.

[0074] To further explain the maximum average flow velocity μ max The relationship between the width w of the feed channel 320, the curvature R of the feed channel 320, the thickness h of the feed channel 320 and the number N of plastic particles per unit area at the cross section of the feed channel 320 is determined, and a preferred embodiment is given. In this embodiment, the feeding width of the feed channel 320 is between 150mm and 300mm, the number of the feed channels 320 is six, the width of the feed channel 320 is preferably 200mm, the width of the filling slot 330 is between 150mm and 200mm, and the width of the filling slot 330 is preferably 175mm.

[0075] According to the specific data of the feeding channel 320 and the filling slot 330, the dimensions of the inner container 3 and the shell 2 can be obtained. The specific design steps are as follows:

[0076] Determine the minimum width of liner 3:

[0077] Each feeding channel 320 requires space: 6×200mm=1200mm

[0078] Total width of five filling slots 330: 75 mm = 875 mm

[0079] Therefore, the total width of the inner liner 3 needs to be at least: 1200mm+875mm=2075mm.

[0080] Estimate the height of the liner 3 and the shell 2:

[0081] For simplicity, it can be assumed that the height of the inner liner 3 also requires a certain amount of space to accommodate this width. An actual height can be set to 1.5 times the width of the inner liner 3, which is approximately 3113 mm.

[0082] The height of the shell 2 should be slightly higher than the inner tank 3 to ensure that there is enough space for installation and maintenance, and the total height is about 3213mm with an increase of 100mm.

[0083] Determine the width of shell 2:

[0084] The width of the shell 2 should be slightly wider than the inner liner 3, at least 100 mm wider, to facilitate installation and maintain structural strength. The total width is about 2175 mm.

[0085] To further illustrate the interrelationships and limitations of the parameters in the metal separator, the relationships between the parameters can be defined based on the given physical and design conditions. The following is a description of the dependencies and interactions between the parameters:

[0086] Parameter definitions and dependencies

[0087] Width w and thickness h of the feeding channel 320 : The width w and thickness h of the feeding channel 320 directly affect the volume and surface area of ​​the feeding channel 320 , thereby determining the number N of plastic particles that can be accommodated in the feeding channel 320 .

[0088] The curvature R of the feeding channel 320: The curvature R affects the path length and curvature of the material flow, and further affects the material flow rate and pressure distribution.

[0089] The number N of plastic particles depends on the width w and thickness h of the feeding channel 320 and the physical size of the particles. In addition, the number N of particles is also limited by the packing density and the size of the particles themselves.

[0090] Specifically, considering the complexity in practical applications, the following mathematical model can be used to describe the relationship between these parameters:

[0091]

[0092] Where l is the average diameter of the plastic particles (in actual use, the diameter and length of the plastic particles are between 1mm-3mm, and the average value is simplified to 2mm). This formula can estimate the number of particles N in the unit cross-section of the feed channel 320.

[0093] Next, the number of particles N per unit cross section of the feeding channel 320 is compared with μ maxThe average flow rate μ of the plastic particles is controlled by adjusting N so that the average flow rate μ meets the requirements of the following formula, thereby meeting the separation requirements of metal impurities.

[0094]

[0095] It should be noted that the number N of plastic pellets in the feeding channel 320 can be controlled by increasing the feed amount by enlarging the port area at one end of the feeding channel 320 close to the feed port 220 or by providing a flow regulating member 8 at one end of the feeding channel 320 close to the feed port 220. The flow regulating member 8 is nested at the port at one end of the feeding channel 320 close to the feed port 220. Specifically, it is a gathering structure, and the gathering direction points from the end away from the feeding channel 320 close to the feed port 220 to the end of the feeding channel 320 close to the feed port 220, so that the cross section of the port of the feeding channel 320 is gradually reduced, so as to adjust the number N of pellets per unit cross section of the feeding channel 320. It can be understood that there are many types of flow regulating members 8, and the magnitude of their gathering will determine the number N of pellets per unit cross section of the feeding channel 320 within a certain period of time, thereby adjusting the average flow rate μ of the plastic pellets.

[0096] The above contents described in this specification are merely examples of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, and they shall all fall within the protection scope of the present invention as long as they do not deviate from the scope defined by the contents of the specification of the present invention.

Claims

1. A method for controlling the flow rate of plastic particles in a metal separation device, characterized in that: The metal separation equipment comprises: A box body, wherein a feed pipe and a discharge pipe are respectively arranged on opposite sides of the box body, and a plurality of material distribution ports are constructed on the box body; A shell, wherein a first accommodating space is constructed inside the shell, and a feed port and a discharge port are respectively arranged at opposite ends of the shell, and the shell is arranged inside the box body so that the feed port is connected to the feed pipe, and the discharge port is connected to the discharge pipe, and a plurality of accommodating grooves and a plurality of discharge ports are constructed around the first accommodating space, each of the accommodating grooves is arranged close to the feed port, and each of the discharge ports is arranged close to the discharge port; An inner container, wherein the inner container is disposed in the first accommodating space, a gap between an outer surface of the inner container and an inner wall of the first accommodating space forms a feeding channel, and a second accommodating space is configured inside the inner container; A plurality of baffles, wherein the baffles are arranged in the feeding channel in a circular array to divide the feeding channel into a plurality of independent feeding channels, one end of the feeding channel is arranged near the feeding port, and the other end of the feeding channel is arranged near the discharging port, each of the feeding channels is connected to each of the containing grooves in a one-to-one correspondence, and each of the feeding channels is connected to each of the discharging ports in a one-to-one correspondence; The induction part includes a transmitting component and a plurality of receiving components, the transmitting component generates a magnetic field in a controlled manner, the transmitting component is arranged in the second accommodating space, and each of the receiving components is arranged in each of the accommodating grooves in a one-to-one correspondence, and the magnetic field generated by the transmitting component passes through each of the receiving components at the same time; A plurality of material distribution pipes, the plurality of material distribution pipes are connected to the plurality of material discharge ports in a one-to-one correspondence, and one end of each of the material distribution pipes, which is away from the shell, passes through the plurality of material distribution ports in a one-to-one correspondence to extend to the outside of the shell; A plurality of closing components, each of which is arranged at each of the discharge ports in a one-to-one correspondence, and the closing components are configured to have a first state and a second state. When the closing components are in the first state, the discharge ports corresponding to the closing components are closed, so that the corresponding feeding channels are in a passage state. When the closing components are in the second state, the feeding channels corresponding to the closing components are blocked, so that the corresponding discharge ports are in a passage state. A control module, the control module is connected to the sensing part to receive the magnetic field change signal of each receiving component, the control module is connected to each closing component, and the control module is configured to: when the magnetic field change exceeds a preset value, switch the corresponding closing component to the second state, and when the magnetic field change is lower than the preset value, switch the corresponding closing component to the first state; The transmitting component is a transmitting coil, and each of the receiving components is a receiving coil. A rod is provided at the center of the second accommodating space, and the extending direction of the rod is the same as the direction in which the feed port points to the discharge port. The transmitting coil is fixedly sleeved on the outside of the rod, and the transmitting coil and each of the receiving coils are provided at the same horizontal height; The control method comprises: Determine a minimum distance d between the metal impurities in the feeding channel and the closing component when the interference of the metal impurities on the magnetic field of the receiving coil exceeds a preset value; Determine a response time Δt for the closing component to switch from a first state to a second state when the receiving coil corresponding to the feeding channel senses metal impurities; Determine the maximum average flow velocity μ of the metal impurities in the feeding channel according to the minimum distance d and the response time Δt max ; The width w of the feeding channel, the curvature R of the feeding channel, the thickness h of the feeding channel and the number N of plastic particles per unit area at the cross section of the feeding channel are adjusted so that the average flow velocity of the metal impurities in the feeding channel is less than the maximum average flow velocity μ max ; The width w of the feeding channel, the curvature R of the feeding channel, the thickness h of the feeding channel and the number N of plastic particles per unit area at the cross section of the feeding channel are adjusted so that the average flow rate of metal impurities in the feeding channel is less than the maximum average flow rate μ max , further, it is shown by the following formula: m<m max Among them, K, α, β and γ are all empirical coefficient values; g is the acceleration due to gravity; μ is the average flow velocity of metal impurities in the feeding channel; R is the curvature of the feeding channel, and the curvature of the feeding channel is equal to the curvature corresponding to the outer curved surface of the inner liner; w is the width of the feeding channel, which is equal to the distance between the two opposite sides of the adjacent partitions; h is the thickness of the feeding channel, and the thickness of the feeding channel is equal to the distance from the outer surface of the liner to the inner wall of the first accommodating space.

2. The method for controlling the flow rate of plastic particles in a metal separation device according to claim 1, characterized in that: The inner wall of the first accommodating space and the side of the inner container facing the first accommodating space are both curved surfaces, and the centers of circles corresponding to the two curved surfaces coincide with each other.

3. The method for controlling the flow rate of plastic particles in a metal separation device according to claim 2, characterized in that: A plurality of curved protrusions are constructed on opposite sides of the two partitions for enclosing the feeding channel to limit the width of the feeding channel, and along the feeding direction of the feeding channel, the curved protrusions are distributed between the accommodating groove and the discharge port.

4. The method for controlling the flow rate of plastic particles in a metal separation device according to claim 2, characterized in that: A filling groove is provided between each adjacent feeding channel, and the filling groove is filled with electromagnetic shielding material.

5. The method for controlling the flow rate of plastic particles in a metal separation device according to claim 2, characterized in that: The inner liner is provided with a plurality of through grooves, and the position of each through groove corresponds to the position of each receiving groove one by one, so that the magnetic field generated by the transmitting component is transmitted to the receiving component located in the corresponding receiving groove through the corresponding through groove, and a plastic sheet is installed in each of the through grooves, and the side of each of the plastic sheets facing the shell is flush with the outer surface of the inner liner.

6. The method for controlling the flow rate of plastic particles in a metal separation device according to claim 2, characterized in that: One end of the inner container close to the feed port is configured as a curved surface.

7. The method for controlling the flow rate of plastic particles in a metal separation device according to claim 2, characterized in that: A flow regulating member for adjusting the port size is provided at one end of each feeding channel close to the feeding port.

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