A plastic volatile matter recovery system and an injection molding volatile matter recovery method

Abstract

The present invention discloses a plastic volatile recovery system and an injection molding volatile recovery method. The plastic volatile recovery system includes a swinging device, a gas collecting hood is installed at the swinging end of the swinging device, a hood opening is formed on the gas collecting hood and is connected to a heat utilization pipe, the gas collecting hood corresponds to a first position, a second position and a third position; the heat utilization pipe is at least partially arranged around the inlet of the screw extruder. The gas collecting hood located at the first position collects the waste gas generated during the melting of the plastic, the gas collecting hood located at the second position collects the waste gas generated during the cooling process, and the gas collecting hood located at the third position collects the waste gas released during the mold opening process of the injection molding device; then, these waste gases are recovered through the heat utilization pipe, and the inlet of the screw extruder is preheated, which can improve the melting efficiency, reduce energy consumption, and realize the precise recovery of waste gas, and has the advantages of high energy utilization rate and better recovery effect.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding recycling structures, in particular to a plastic volatile matter recovery system and an injection molding volatile matter recovery method. Background Art

[0002] Injection molding is a widely used process for manufacturing plastic products. Its basic principle is to heat thermoplastics to a molten state, inject the molten plastic into the mold cavity through the screw of the injection molding machine, and then form the plastic product into the desired shape after cooling and solidification. The injection molding process typically produces a lot of waste gas. The reasons for this are: 1. In the high-temperature molten state, some plastic raw materials undergo thermal decomposition, producing volatile organic compounds (VOCs) and other harmful gases; 2. When the mold is opened, unburned plastic volatiles and other volatile compounds are released. To reduce the harm to the environment and the health of operators, these plastic volatiles need to be recovered and processed.

[0003] In this regard, the solution for recycling the above-mentioned plastic volatiles mainly adopts the solution of a full-workshop ventilation system, that is, installing large-scale ventilation equipment in the workshop, and exhausting the waste gas containing plastic volatiles out of the workshop through forced ventilation. However, ventilation of the entire workshop requires a large amount of energy, which easily leads to waste of resources. In addition, it is difficult for the ventilation equipment to evenly cover the ventilation effect in the workshop, and there is a risk of local accumulation of plastic volatiles in corners. It can be seen that the plastic volatiles recovery solution in the existing technology has technical problems of low resource utilization and poor recovery effect. Summary of the Invention

[0004] The object of the present invention is to provide a plastic volatiles recovery system and an injection molding volatiles recovery method to solve the problems of low resource utilization and poor recovery effect in the existing plastic volatiles recovery solutions.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A plastic volatile matter recovery system includes a swing device, a gas collecting hood is installed at the swing end of the swing device, a hood opening is formed on the gas collecting hood and is connected to a heat utilization pipe;

[0007] A screw extrusion device, an injection device and an injection molding device are arranged in sequence along the horizontal direction below the swing device, and the swing device is used to drive the air collecting hood to move between the first position, the second position and the third position; the air collecting hood located at the first position is arranged toward the nozzle air hole of the injection device, the air collecting hood located at the second position is arranged toward the mold air hole of the injection molding device, and the air collecting hood located at the third position is arranged toward the parting area of the injection molding device; the heat utilization pipe is at least partially arranged around the inlet of the screw extrusion device.

[0008] Optionally, it further comprises a telescopic device, the swing device is mounted on the telescopic end of the telescopic device; the injection device is connected to a first switch valve device, and the injection molding device is connected to a second switch valve device;

[0009] When the gas collecting hood is located at the first position, the first switch valve device connects the gas collecting hood with the injection device; when the gas collecting hood is located at the second position, the second switch valve device connects the gas collecting hood with the injection molding device;

[0010] The telescopic device is used to drive the gas collecting hood to move in a direction close to or away from the first switch valve device, and is also used to drive the gas collecting hood to move in a direction close to or away from the second switch valve device.

[0011] Optionally, the first switch valve device and the second switch valve device each include an air duct arranged toward the swing device, wherein an opening and closing component having an open state and a closed state is provided in the air duct;

[0012] When the air collecting hood faces the air duct, the opening and closing assembly in the corresponding air duct is in an open state; when the air collecting hood is away from the air duct, the opening and closing assembly in the corresponding air duct is in a closed state.

[0013] Optionally, the opening and closing assembly includes a plurality of opening and closing valve discs, which are circumferentially distributed in the air duct and spliced together to form a closing member for blocking the air duct;

[0014] The end of the opening and closing valve disc extends to the outside of the air guide tube and is rotatably connected to the outer wall of the air guide tube via a valve shaft. The valve shaft is also rotatably connected to a swing member. One end of the swing member is fixedly connected to the end of the opening and closing valve disc, and the other end of the swing member is equipped with a first magnetic attraction portion.

[0015] A second magnetic attraction portion is provided on the inner wall of the hood opening of the gas collecting hood at a position corresponding to the first magnetic attraction portion; when the gas collecting hood is arranged outside the air duct, the first magnetic attraction portion is magnetically attracted by the second magnetic attraction portion, causing the corresponding opening and closing valve plate to move in a direction close to the inner wall surface of the air duct.

[0016] Optionally, when the opening and closing assembly in the air duct is in a closed state, the plane where the plurality of opening and closing valve plates are located is arranged perpendicular to the air outlet direction of the air duct, and the swinging member is arranged to tilt upward in a direction away from the ground;

[0017] When the opening and closing assembly in the air duct is in an open state, the plane where the multiple opening and closing valve plates are located is inclined to the air outlet direction of the air duct, and the swinging member is inclined downward in a direction close to the ground.

[0018] Optionally, a first avoidance groove is formed in the air guide pipe at a position corresponding to the opening and closing valve disc, the first avoidance groove is connected to a second avoidance groove, and the width of the second avoidance groove is greater than that of the first avoidance groove; the opening and closing valve disc includes a connected triangular portion and a connecting portion, and the triangular portion is connected to the valve shaft through the connecting portion;

[0019] The width of the connecting portion matches the width of the first avoidance groove and passes through the first avoidance groove, and the width of the bottom side of the triangular portion matches the width of the second avoidance groove, so that the triangular portion can be at least partially accommodated in the second avoidance groove, and the length from the top corner of the triangular portion to the bottom side is greater than the length of the second avoidance groove.

[0020] Optionally, a baffle portion is further installed on the connecting portion, and when the opening and closing assembly in the air duct is in a closed state, the baffle portion is located in the first avoidance groove and the second avoidance groove.

[0021] Optionally, the telescopic device includes a telescopic mounting plate and a telescopic cylinder arranged on the telescopic mounting plate, and the swing device is slidably connected to the telescopic mounting plate and fixedly connected to the telescopic end of the telescopic cylinder.

[0022] Optionally, the swing device includes a swing fixing plate slidably connected to the telescopic mounting plate, and a swing motor is mounted on the swing fixing plate;

[0023] The swing device further comprises a swing movable plate, a first gear is mounted on one side of the swing fixed plate, a second gear is mounted on one side of the swing movable plate, and the second gear is meshed with the first gear;

[0024] A first synchronous wheel is installed on the other side of the swing fixed plate, and a second synchronous wheel is installed on the other side of the swing movable plate. The first synchronous wheel and the second synchronous wheel are outer-circuited with a synchronous belt; the motor shaft of the swing motor is respectively connected to the first gear and the first synchronous wheel.

[0025] A method for recovering injection molding volatiles, applied to the plastic volatiles recovery system described above, comprises:

[0026] Adding plastic raw materials and injecting the molten plastic raw materials into the injection molding device, and recovering the waste gas through the gas collecting hood at the first position;

[0027] Cooling the plastic raw material, moving the gas collecting hood to a second position, and recovering the waste gas through the gas collecting hood at the second position;

[0028] Take out the plastic workpiece, move the gas collecting hood to the third position, and recover the exhaust gas through the gas collecting hood at the third position.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a plastic volatile recovery system and an injection molding volatile recovery method. During the injection molding process, plastic raw material is fed into a screw extruder, melted and sheared, and injected into a mold cavity of an injection molding device through a nozzle of an injection device. During this process, waste gas generated during the plastic melting is collected by a gas collecting hood located at a first position. After the plastic raw material enters the injection molding device, it is cooled in the injection molding device, and waste gas is discharged through the mold pores of the injection molding device, so that the waste gas generated during the cooling process is collected by a gas collecting hood located at a second position. After the plastic workpiece is formed, the injection molding device is opened to facilitate removal of the plastic workpiece. During this process, waste gas released by the injection molding device during the mold opening process is collected by a gas collecting hood located at a third position. Subsequently, the waste gas is recovered by a heat utilization pipe, and the inlet of the screw extruder is preheated. This can improve melting efficiency, reduce energy consumption, and achieve accurate waste gas recovery, further improving energy utilization. Therefore, the plastic volatile recovery system and the injection molding volatile recovery method have the advantages of high energy utilization and better recovery effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention.

[0033] Figure 1 A schematic diagram of the overall structure of a plastic volatiles recovery system provided by an embodiment of the present invention;

[0034] Figure 2 A schematic front cross-sectional view of the structure of a plastic volatiles recovery system provided by an embodiment of the present invention;

[0035] Figure 3 A schematic structural diagram of a plastic volatiles recovery system in a first state provided by an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of the second state structure of the plastic volatiles recovery system provided by an embodiment of the present invention;

[0037] Figure 5 A schematic structural diagram of a plastic volatiles recovery system in a closed state provided by an embodiment of the present invention;

[0038] Figure 6 for Figure 5 A schematic diagram of the partially enlarged structure at point A;

[0039] Figure 7 A schematic structural diagram of a plastic volatiles recovery system in an open state provided by an embodiment of the present invention;

[0040] Figure 8 for Figure 7 A schematic diagram of the local enlarged structure at point B;

[0041] Figure 9 A schematic diagram of the partial structure of a plastic volatiles recovery system provided in an embodiment of the present invention.

[0042] Illustration: 001, first position; 002, second position;

[0043] 100, swing device; 110, swing fixed plate; 120, swing motor; 130, swing movable plate; 141, first gear; 142, second gear; 151, first synchronous wheel; 152, second synchronous wheel; 153, synchronous belt; 161, horizontal cylinder; 162, horizontal slider;

[0044] 210, gas collecting hood; 211, hood opening; 220, heat utilization pipe;

[0045] 310, screw extrusion device; 320, injection device; 330, injection molding device;

[0046] 400, telescopic device; 410, telescopic mounting plate; 420, telescopic cylinder;

[0047] 500, first switch valve device; 510, air guide pipe; 511, first avoidance groove; 512, second avoidance groove; 513, limit block; 520, opening and closing assembly; 521, opening and closing valve plate; 5211, triangular portion; 5212, connecting portion; 522, valve shaft; 523, swinging member; 524, first magnetic portion; 525, baffle portion; 530, air guide ring; 600, second switch valve device. DETAILED DESCRIPTION

[0048] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component.

[0050] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0051] The plastic volatiles recovery system provided in this embodiment is suitable for injection molding production scenarios and can recycle and reuse plastic volatiles generated during the injection molding process. Its core advantage is that it can accurately recover waste gas generated at different stages to improve energy utilization and recovery effect.

[0052] like Figures 1 to 3 As shown, the plastic volatile recovery system in this embodiment includes a swinging device 100, and a gas collecting hood 210 is installed at the swinging end of the swinging device 100. A hood opening 211 is formed on the gas collecting hood 210 and is connected to a heat utilization pipe 220; a fan, a filter device, a volatile recovery device and other structures can be set on the gas transmission path from the gas collecting hood 210 to the heat utilization pipe 220 to process the waste gas collected by the gas collecting hood 210. It can also be set to first transmit the waste gas to the heat utilization pipe 220 through the fan, and then process the collected waste gas through the gas treatment structures such as the filter device and the volatile recovery device. In this embodiment, it is sufficient to realize the transmission of the waste gas from the gas collecting hood 210 to the heat utilization pipe 220. Other structures such as the filter device and the volatile recovery device are not described in detail in this embodiment.

[0053] Below the swing device 100, a screw extrusion device 310, an injection device 320 and an injection molding device 330 are arranged in sequence along the horizontal direction; the screw extrusion device 310 can melt and extrude plastic particles through a rotating screw, and the injection device 320 can inject the molten plastic into the mold of the injection molding device 330 through a nozzle. The injection molding device 330 includes a mold for molding a plastic workpiece; it should be pointed out that the above-mentioned nozzle and mold are both equipped with air holes, and the nozzle air holes are used to discharge the gas generated when the plastic raw material is melted in the screw extrusion device 310 and the nozzle, and the mold air holes are used to discharge the air and exhaust gas in the mold cavity when the molten plastic raw material fills the mold cavity. Among them, the swing device 100 is used to drive the gas collecting hood 210 to move between the first position 001, the second position 002 and the third position; as Figure 3 As shown, the air collecting cover 210 at the first position 001 is arranged toward the nozzle air hole of the injection device 320, as shown in FIG. Figure 4 As shown, the air collecting hood 210 at the second position 002 is arranged toward the mold air holes of the injection molding device 330 ; the air collecting hood 210 at the third position is arranged toward the parting area of the injection molding device 330 .

[0054] Specifically, during the injection molding process, the plastic raw material is put into the screw extruder 310, the plastic raw material is melted and sheared, and is injected into the mold cavity of the injection molding device 330 through the nozzle of the injection device 320. In this process, the exhaust gas generated when the plastic is melted is collected by the gas collecting hood 210 located at the first position 001; after the plastic raw material enters the injection molding device 330, it is cooled in the injection molding device 330, and the exhaust gas is discharged through the mold pores of the injection molding device 330, so that the exhaust gas generated during the cooling process is collected by the gas collecting hood 210 located at the second position 002. The waste gas is collected; after the plastic workpiece is formed, the injection molding device 330 opens the mold to facilitate the removal of the plastic workpiece. During this process, the waste gas released by the injection molding device 330 during the mold opening process is collected by the gas collecting hood 210 located at the third position; then, the waste gas is recovered through the heat utilization pipe 220, and the inlet of the screw extruder 310 is preheated, which can improve the melting efficiency, reduce energy consumption, and realize the precise recovery of waste gas, further improving the energy utilization rate. Therefore, the plastic volatile matter recovery system has the advantages of high energy utilization rate and better recovery effect.

[0055] Furthermore, the plastic volatile recovery system in this embodiment also includes a telescopic device 400, and the swing device 100 is installed on the telescopic end of the telescopic device 400; the injection device 320 is connected to the first switch valve device 500, and the injection molding device 330 is connected to the second switch valve device 600; when the gas collecting hood 210 is located in the first position 001, the first switch valve device 500 connects the gas collecting hood 210 and the injection device 320; when the gas collecting hood 210 is located in the second position 002, the second switch valve device 600 connects the gas collecting hood 210 and the injection molding device 330; the telescopic device 400 is used to drive the gas collecting hood 210 to move in a direction close to or away from the first switch valve device 500, and is also used to drive the gas collecting hood 210 to move in a direction close to or away from the second switch valve device 600.

[0056] It is understood that by adding the telescopic device 400, not only can the air collecting hood 210 be swung, but it can also be telescopically moved up and down, and the hood opening 211 can be respectively covered outside the first switch valve device 500 and the second switch valve device 600 to further improve the recycling efficiency. For example, when the plastic raw material is put into the screw extruder 310, the plastic raw material is sheared by the screw and injected into the mold cavity through the nozzle of the injection device 320. At this time, the air collecting hood 210 at the first position 001 cooperates with the nozzle air hole to discharge the waste gas; after the mold cavity is about to be filled with the plastic raw material, the plastic raw material in the mold cavity is about to be cooled, and the air collecting hood 210 at the second position 002 is used to cooperate with the mold air hole to discharge the waste gas, thereby achieving precise discharge of the waste gas.

[0057] Specifically, if Figures 3 to 8 As shown, the first switch valve device 500 and the second switch valve device 600 both include an air duct 510 disposed toward the swing device 100, and an opening and closing assembly 520 with an open state and a closed state is disposed in the air duct 510; when the gas collecting cover 210 is directed toward the air duct 510, as shown in FIG. Figure 8 As shown, the opening and closing assembly 520 in the corresponding air duct 510 is in the open state; when the air collecting cover 210 is away from the air duct 510, as shown in FIG. Figure 6 As shown, the opening and closing component 520 in the corresponding air duct 510 is in a closed state.

[0058] Furthermore, if Figures 5 to 8As shown, the opening and closing assembly 520 includes a plurality of opening and closing valve discs 521, which are circumferentially distributed in the air duct 510 and spliced to form a closing member for sealing the air duct 510; the end of the opening and closing valve disc 521 extends to the outside of the air duct 510 and is rotatably connected to the outer wall of the air duct 510 through the valve shaft 522, and the valve shaft 522 is also rotatably connected to a swing member 523, one end of the swing member 523 is fixedly connected to the end of the opening and closing valve disc 521, and the other end of the swing member 523 is installed with a first magnetic attraction portion 524; a second magnetic attraction portion is provided on the inner wall of the cover opening 211 of the air collecting hood 210 at a position corresponding to the first magnetic attraction portion 524; when the air collecting hood 210 is covered outside the air duct 510, the first magnetic attraction portion 524 is magnetically attracted by the second magnetic attraction portion, causing the corresponding opening and closing valve disc 521 to move in a direction close to the inner wall of the air duct 510.

[0059] It is understood that both the first on-off valve device 500 and the second on-off valve device 600 include an air duct 510 and an opening and closing assembly 520, which together implement intelligent switching of the gas collection channel. Specifically, the opening and closing assembly 520 is composed of a plurality of circumferentially distributed opening and closing valve discs 521, which can be spliced together to form a complete closure member for sealing the air duct 510. In conjunction with the arrangement of the valve shaft 522, the swinging member 523, and the first magnetic portion 524, when the gas collection cover 210 is moved to the first position 001 to cover the air duct 510 of the first on-off valve device 500, the second magnetic portion on the gas collection cover 210 magnetically attracts each first magnetic portion 524 and moves, causing the opening and closing valve disc 521 to move toward the inner wall of the air duct 510, thereby placing the first on-off valve device 500 in the open state. When the gas collection cover 210 moves from the first position 001 to the second position 002, the same principle is used to place the second on-off valve device 600 in the open state. At this time, because the second magnetic portion has moved away from the first magnetic portion 524 of the first on-off valve device 500 along its original path, the opening and closing valve disc 521 is reset under the action of the magnetic field, placing the first on-off valve device 500 in the closed state. This arrangement ensures that the system only collects exhaust gas from specific locations when necessary, avoiding unnecessary energy loss and achieving precise gas collection without the need for an additional control system.

[0060] As a specific embodiment, when the opening and closing component 520 in the air duct 510 is in a closed state, the plane where the multiple opening and closing valve plates 521 are located is perpendicular to the air outlet direction of the air duct 510, and the swinging member 523 is tilted upward in a direction away from the ground; when the opening and closing component 520 in the air duct 510 is in an open state, the plane where the multiple opening and closing valve plates 521 are located is tilted to the air outlet direction of the air duct 510, and the swinging member 523 is tilted downward in a direction close to the ground.

[0061] Taking the first switch valve device 500 as an example, when it is in the closed state, it is not affected by the magnetic field. The gravity moment of each opening and closing valve piece 521 on the inner side (inside the air duct 510) is greater than the gravity moment of the opening and closing valve piece 521 on the outer side. In conjunction with the limit block 513 protruding from the inner wall of the air duct 510, the plane where the multiple opening and closing valve pieces 521 are located is perpendicular to the outlet direction of the air duct 510. When in the open and closed state, since the gas collecting cover 210 covers the air duct 510, In addition, the applied magnetic field makes the sum of the moments on the outside of the opening and closing valve disc 521 (the sum of the moments of gravity and the magnetic field) greater than the gravitational moment on the inside, thereby driving the opening and closing valve disc 521 to flip, so that the plane where the opening and closing valve disc 521 is located is inclined with respect to the outlet direction of the air guide pipe 510. At this time, the inclination direction of the opening and closing valve disc 521 is also set at an acute angle with the outlet direction of the air guide pipe 510, which means that the exhausted gas can be discharged along the opening and closing valve disc 521, thereby playing a role in diversion.

[0062] As another optional embodiment, a torsion spring (not shown) can be installed on the valve shaft 522. The elastic force provided by the torsion spring causes the opening and closing valve disc 521 to abut against the limit block 513 protruding from the inner wall of the air duct 510, so that the plane where the multiple opening and closing valve discs 521 are located is perpendicular to the air outlet direction of the air duct 510; when in the open and closed state, since the gas collecting cover 210 covers the outside of the air duct 510 and applies a magnetic field, the sum of the torques of the opening and closing valve discs 521 on the outside (the sum of the torques of gravity and the magnetic field) is greater than the torque provided by the torsion spring, thereby driving the opening and closing valve discs 521 to flip, so that the plane where the opening and closing valve discs 521 are located is inclined to the air outlet direction of the air duct 510.

[0063] Furthermore, a first avoidance groove 511 is provided in the air guide tube 510 at a position corresponding to the opening and closing valve plate 521, and the first avoidance groove 511 is connected to the second avoidance groove 512, and the width of the second avoidance groove 512 is greater than the width of the first avoidance groove 511; the opening and closing valve plate 521 includes a connected triangular portion 5211 and a connecting portion 5212, and the triangular portion 5211 is connected to the valve shaft 522 through the connecting portion 5212; wherein, the width of the connecting portion 5212 matches the width of the first avoidance groove 511 and passes through the first avoidance groove 511, and the bottom edge width of the triangular portion 5211 matches the width of the second avoidance groove 512, so that the triangular portion 5211 can be at least partially accommodated in the second avoidance groove 512, and the length from the top corner to the bottom edge of the triangular portion 5211 is greater than the length of the second avoidance groove 512.

[0064] For example, the air duct 510 is provided with a first avoidance groove 511 and a second avoidance groove 512, which have different widths, forming a stepped groove body, and correspondingly, the opening and closing valve plate 521 is provided with a connected triangular portion 5211 and a connecting portion 5212; when the air collecting cover 210 is provided outside the air duct 510, at this time, the second magnetic portion on the air collecting cover 210 will attract the first magnetic portion 524 on the opening and closing valve plate 521, and the connecting portion 5212 will pass through the larger The narrow first avoidance groove 511 plays an avoidance role, while the triangular portion 5211 will partially enter the wider second avoidance groove 512 and be abutted by the second avoidance groove 512, thereby preventing the opening and closing valve plate 521 from detaching from the air duct 510, thereby ensuring that the opening and closing valve plate 521 can be tightly attached to the inner wall of the air duct 510 when in the open state, thereby minimizing airflow resistance, improving exhaust gas collection efficiency, and ensuring that the opening and closing valve plate 521 will not detach from the air duct 510.

[0065] It should be noted that the cross section of the air guide tube 510 in this embodiment is a square tube, and four groups of opening and closing valve plates 521 are correspondingly provided, with the angle of each group being 90° to close the above square tube.

[0066] As a supplementary embodiment, a baffle portion 525 is also mounted on the connecting portion 5212. When the opening and closing assembly 520 in the air duct 510 is in the closed state, the baffle portion 525 is located in the first avoidance groove 511 and the second avoidance groove 512. For example, when the air hood 210 is removed from any air duct 510, the opening and closing assembly 520 is first switched from an open state to a closed state. At this point, a relatively enclosed space is formed at the upper end of the air duct 510 (above the closure member), allowing the air hood 210 to fully absorb residual exhaust gas, thereby further improving recovery efficiency.

[0067] In this embodiment, the first switch valve device 500 also includes an air guide ring 530, which is arranged outside the screw extrusion device 310 and connected to the injection device 320 to guide the exhaust gas discharged from the screw extrusion device 310 and the nozzle to the air guide pipe 510 of the first switch valve device 500 respectively.

[0068] As a specific embodiment, the telescopic device 400 includes a telescopic mounting plate 410 and a telescopic cylinder 420 arranged on the telescopic mounting plate 410. The swing device 100 is slidingly connected to the telescopic mounting plate 410 and fixedly connected to the telescopic end of the telescopic cylinder 420.

[0069] Furthermore, the swing device 100 includes a swinging fixed plate 110 that is slidingly connected to the telescopic mounting plate 410, and a swinging motor 120 is installed on the swinging fixed plate 110; the swinging device 100 also includes a swinging movable plate 130, a first gear 141 is installed on one side of the swinging fixed plate 110, and a second gear 142 is installed on one side of the swinging movable plate 130, and the second gear 142 is engaged with the first gear 141; a first synchronous wheel 151 is installed on the other side of the swinging fixed plate 110, and a second synchronous wheel 152 is installed on the other side of the swinging movable plate 130, and the first synchronous wheel 151 and the second synchronous wheel 152 are respectively provided with a synchronous belt 153; the motor shaft of the swinging motor 120 is respectively connected to the first gear 141 and the first synchronous wheel 151.

[0070] It is understood that when the position of the air hood 210 needs to be adjusted, the swing motor 120 first drives the synchronous wheel structure, which, in conjunction with the meshing of the gear structure, causes the swing movable plate 130 to swing relative to the swing fixed plate 110, causing the air hood 210, which is fixed to the swing movable plate 130, to swing synchronously. Subsequently, the telescopic mounting plate 410 is extended by the telescopic cylinder 420 to adjust the extension and contraction of the air hood 210, so that the air hood 210 is located outside the air duct 510. This structure is more suitable for scenarios where the load on the air hood 210 is relatively small, further reducing resource consumption.

[0071] Additionally, a horizontal cylinder 161 and a horizontal guide rail may be installed on the swinging movable plate 130 , a horizontal slider 162 may be slidably connected to the horizontal guide rail, and the air collecting hood 210 may be fixedly connected to the bottom of the horizontal slider 162 to improve the flexibility of the air collecting hood 210 .

[0072] Additionally, a universal joint structure may be installed on the swing fixing plate 110 , and the universal joint structure is connected to the horizontal slider 162 to improve the stability of the air collecting hood 210 .

[0073] As another optional implementation, a combination of a three-axis moving platform (including linear motors in the X, Y, and Z directions) and a rotary cylinder can be selected to achieve the swing of the gas collecting hood 210 in space.

[0074] Example 2:

[0075] This embodiment further provides a method for recovering injection molding volatiles, which is applied to the plastic volatiles recovery system in the first embodiment, comprising:

[0076] S1. Add plastic raw materials and inject the molten plastic raw materials into the injection molding device 330, and recover the exhaust gas through the gas collecting hood 210 at the first position 001;

[0077] S2. After the mold cavity is about to be filled with the plastic raw material, the plastic raw material is cooled, and the gas collecting hood 210 is moved to the second position 002, and the waste gas is recovered through the gas collecting hood 210 at the second position 002;

[0078] S3. After cooling, take out the plastic workpiece, move the gas collecting hood 210 to a third position, and recover the waste gas through the gas collecting hood 210 at the third position.

[0079] Steps S1 to S3 above all involve the movement of the air hood 210. The movement principle of the air hood 210 is as follows: first, the swing motor 120 drives the first gear 141 and the first synchronous wheel 151 to rotate. These gears, in meshing with each other and acting on the synchronous belt 153, drive the swing movable plate 130 to swing in space. Then, the telescopic cylinder 420 controls the air hood 210 to move toward or away from the air duct 510.

[0080] In the above-mentioned steps S1 to S2, the process of the gas collecting hood 210 approaching the gas duct 510 is involved, and the principle is as follows: the magnetic field applied by the gas collecting hood 210 outside the gas duct 510 makes the sum of the moments of the opening and closing valve plate 521 on the outside (the sum of the moments of gravity and the magnetic field) greater than the gravitational moment on the inside, thereby driving the opening and closing valve plate 521 to flip, so that the plane where the opening and closing valve plate 521 is located is inclined to the gas outlet direction of the gas duct 510. At this time, the inclination direction of the opening and closing valve plate 521 is also set at an acute angle to the gas outlet direction of the gas duct 510, which means that the exhausted gas can be discharged along the opening and closing valve plate 521, playing a role in diversion.

[0081] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plastic volatile matter recovery system, characterized in that: It comprises a swing device (100), a gas collecting hood (210) being installed at a swing end of the swing device (100), a hood opening (211) being formed on the gas collecting hood (210) and being connected to a heat utilization pipe (220); A screw extrusion device (310), an injection device (320) and an injection molding device (330) are arranged in sequence along the horizontal direction below the swing device (100), and the swing device (100) is used to drive the gas collecting hood (210) to move between a first position (001), a second position (002) and a third position; the gas collecting hood (210) located at the first position (001) is arranged toward the nozzle air hole of the injection device (320), the gas collecting hood (210) located at the second position (002) is arranged toward the mold air hole of the injection molding device (330), and the gas collecting hood (210) located at the third position is arranged toward the parting area of the injection molding device (330); the heat utilization pipe (220) is at least partially arranged around the inlet of the screw extrusion device (310); The injection device (320) is connected to a first switch valve device (500), and the injection molding device (330) is connected to a second switch valve device (600); the first switch valve device (500) and the second switch valve device (600) both include an air guide tube (510) disposed toward the swing device (100), and an opening and closing component (520) having an open state and a closed state is disposed in the air guide tube (510); The opening and closing assembly (520) comprises a plurality of opening and closing valve sheets (521), wherein the plurality of opening and closing valve sheets (521) are arranged in a circumferential distribution in the air guide tube (510) and are spliced together to form a closing member for sealing the air guide tube (510); The end of the opening and closing valve disc (521) extends outside the air guide tube (510) and is rotatably connected to the outer wall of the air guide tube (510) via a valve shaft (522). The valve shaft (522) is also rotatably connected to a swing member (523). One end of the swing member (523) is fixedly connected to the end of the opening and closing valve disc (521), and the other end of the swing member (523) is mounted with a first magnetic attraction portion (524). A second magnetic attraction portion is provided at a position corresponding to the first magnetic attraction portion (524) on the inner wall of the hood opening (211) of the gas collecting hood (210); when the gas collecting hood (210) is located outside the air duct (510), the first magnetic attraction portion (524) is magnetically attracted by the second magnetic attraction portion, causing the corresponding opening and closing valve plate (521) to move in a direction close to the inner wall surface of the air duct (510).

2. A plastic volatile matter recovery system according to claim 1, characterized in that: It also includes a telescopic device (400), and the swing device (100) is installed on the telescopic end of the telescopic device (400); When the gas collecting hood (210) is located at the first position (001), the first switch valve device (500) connects the gas collecting hood (210) and the injection device (320); when the gas collecting hood (210) is located at the second position (002), the second switch valve device (600) connects the gas collecting hood (210) and the injection molding device (330); The telescopic device (400) is used to drive the gas collecting hood (210) to move in a direction approaching or away from the first switch valve device (500), and is also used to drive the gas collecting hood (210) to move in a direction approaching or away from the second switch valve device (600).

3. A plastic volatile matter recovery system according to claim 2, characterized in that: When the gas collecting hood (210) faces the air duct (510), the opening and closing component (520) corresponding to the air duct (510) is in an open state; when the gas collecting hood (210) moves away from the air duct (510), the opening and closing component (520) corresponding to the air duct (510) is in a closed state.

4. A plastic volatile matter recovery system according to claim 3, characterized in that: When the opening and closing assembly (520) in the air guide tube (510) is in a closed state, the plane where the plurality of opening and closing valve plates (521) are located is arranged perpendicular to the air outlet direction of the air guide tube (510), and the swinging member (523) is arranged to tilt upward in a direction away from the ground; When the opening and closing assembly (520) in the air guide pipe (510) is in an open state, the plane where the plurality of opening and closing valve plates (521) are located is arranged obliquely with respect to the air outlet direction of the air guide pipe (510), and the swinging member (523) is arranged obliquely downward in a direction close to the ground.

5. A plastic volatile matter recovery system according to claim 3, characterized in that: The air guide tube (510) is provided with a first avoidance groove (511) at a position corresponding to the opening and closing valve disc (521); the first avoidance groove (511) is connected to a second avoidance groove (512); the width of the second avoidance groove (512) is greater than the width of the first avoidance groove (511); the opening and closing valve disc (521) comprises a connected triangular portion (5211) and a connecting portion (5212); the triangular portion (5211) is connected to the valve shaft (522) via the connecting portion (5212); The width of the connecting portion (5212) matches the width of the first avoidance groove (511) and passes through the first avoidance groove (511), and the width of the bottom side of the triangular portion (5211) matches the width of the second avoidance groove (512), so that the triangular portion (5211) can be at least partially accommodated in the second avoidance groove (512), and the length from the top corner of the triangular portion (5211) to the bottom side is greater than the length of the second avoidance groove (512).

6. A plastic volatile matter recovery system according to claim 5, characterized in that: A baffle portion (525) is also mounted on the connecting portion (5212); when the opening and closing assembly (520) in the air guide tube (510) is in a closed state, the baffle portion (525) is located in the first avoidance groove (511) and the second avoidance groove (512).

7. A plastic volatile matter recovery system according to claim 2, characterized in that: The telescopic device (400) comprises a telescopic mounting plate (410) and a telescopic cylinder (420) arranged on the telescopic mounting plate (410); the swing device (100) is slidably connected to the telescopic mounting plate (410) and fixedly connected to the telescopic end of the telescopic cylinder (420).

8. A plastic volatile matter recovery system according to claim 7, characterized in that: The swing device (100) comprises a swing fixing plate (110) slidably connected to the telescopic mounting plate (410), and a swing motor (120) is mounted on the swing fixing plate (110); The swing device (100) further comprises a swing movable plate (130), a first gear (141) being mounted on one side of the swing fixed plate (110), a second gear (142) being mounted on one side of the swing movable plate (130), and the second gear (142) being meshed with the first gear (141); A first synchronous wheel (151) is installed on the other side of the swing fixed plate (110), and a second synchronous wheel (152) is installed on the other side of the swing movable plate (130). The first synchronous wheel (151) and the second synchronous wheel (152) are provided with a synchronous belt (153) on their outer sleeves; the motor shaft of the swing motor (120) is respectively connected to the first gear (141) and the first synchronous wheel (151).

9. A method for recovering volatiles from injection molding, characterized in that: The system is applied to a plastic volatile matter recovery system as claimed in any one of claims 1 to 8, comprising: Adding plastic raw materials and injecting the molten plastic raw materials into the injection molding device, and recovering the waste gas through the gas collecting hood at the first position; Cooling the plastic raw material, moving the gas collecting hood to a second position, and recovering the waste gas through the gas collecting hood at the second position; Take out the plastic workpiece, move the gas collecting hood to the third position, and recover the exhaust gas through the gas collecting hood at the third position.

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