Automatic screen changer for PCR (Polymerase Chain Reaction) plastic extrusion

Abstract

The utility model belongs to the technical field of plastic extruders, and particularly relates to an automatic screen changer for PCR (Polymerase Chain Reaction) plastic extrusion, which comprises a box body provided with a material channel and a screen changing channel, transfer holes are respectively formed in the upper and lower ends of the sliding plate; a filtering hole is formed in each inserting plate, a limiting ring is arranged in each filtering hole, and a filtering net is installed in each limiting ring; each butt joint structure comprises a butt joint pipe, a sealing sleeve and a reset spring; two driving mechanisms; and a lifting mechanism. On the premise that the automation effect is guaranteed, the sealing effect is enhanced, the situation of raw material leakage is avoided, the clamping and locking effects are achieved, stable operation of filtering operation is guaranteed, the insertion plate is convenient to disassemble and assemble, the replacement process is simple, cleaning and maintenance are convenient, the difficulty of replacement of the filter screen is reduced, and the service life of the filter screen is prolonged. And the replacement time is shortened, so that the working efficiency is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of plastic extruder technology, specifically relating to an automatic screen changer for PCR plastic extrusion. Background Technology

[0002] PCR plastics, or Post-Consumer Recycled Material, are also known in the industry as post-consumer resins or recycled plastics. These plastics are primarily composed of waste generated during the circulation, consumption, and use of plastics. Through advanced physical or chemical recycling technologies, this waste is transformed into high-value industrial raw materials, thus achieving effective regeneration and recycling of resources.

[0003] In the plastics processing industry, extruders are widely used as key equipment for processing plastic products. However, since plastic raw materials, especially the aforementioned post-consumer recycled materials, often contain a high proportion of impurities, automatic screen changers are usually installed at the front end of the extruder to effectively intercept and filter these impurities in order to ensure product quality.

[0004] However, current automatic screen changers have significant shortcomings in sealing performance, which can easily lead to raw material leakage. In addition, the process of disassembling and replacing the filter screen is cumbersome, which not only increases the difficulty of replacing the filter screen, but also prolongs the replacement time, thereby affecting work efficiency and bringing additional labor intensity. Utility Model Content

[0005] The purpose of this invention is to provide an automatic screen changer for PCR plastic extrusion, which solves the technical problems of poor sealing performance and troublesome screen replacement in the prior art.

[0006] This utility model discloses an automatic screen changer for PCR plastic extrusion, comprising:

[0007] The box body has mutually perpendicular material channels and screen changing channels. The material channels are arranged horizontally through the box, and the screen changing channels are arranged vertically through the box. Movable annular grooves are opened on both sides inside the material channels.

[0008] The sliding plate is slidably installed in the screen changing channel, and transfer holes adapted to the movable ring groove are respectively opened at the upper and lower ends;

[0009] Two insert plates, each corresponding to a transfer hole, are inserted into one side of the slide plate. Each insert plate has a filter hole that matches the transfer hole. A limiting ring is provided inside the filter hole, and a filter screen is installed inside the limiting ring.

[0010] Two docking structures are installed within the material channel and arranged opposite each other on the left and right sides of the slide plate, and each docking structure includes:

[0011] The connecting pipe is embedded at the inlet and outlet of the material channel and extends into the movable annular groove.

[0012] A closed sleeve is slidably fitted onto the connecting pipe and is adapted to the transfer hole and filter hole.

[0013] A return spring is movably sleeved on the connecting tube and constrained between the end of the closed sleeve and the bottom of the movable annular groove;

[0014] Two drive mechanisms are installed inside the housing and arranged opposite each other on the front and rear sides of the slide plate, and are connected to the two closed sleeves in a transmission manner.

[0015] A lifting mechanism is installed at the top of the box and is connected to the sliding plate via a transmission.

[0016] This application enhances the sealing effect while ensuring automation, preventing material leakage. It also features a locking mechanism to ensure stable operation of the filtration process. Furthermore, the insert plate is easy to install and remove, and the replacement process is simple, facilitating cleaning and maintenance. This not only reduces the difficulty of replacing the filter screen but also shortens the replacement time, thereby improving work efficiency and reducing labor intensity.

[0017] Based on the above technical solution, the solution of this application can be further improved as follows:

[0018] Preferably, the inner port of the connecting pipe is provided with a guide ring groove with a right-angled triangle cross section; this solution can guide the material to flow in or out more smoothly, which helps to reduce eddies and turbulence in the material flow process, thereby improving the stability of the flow, reducing the risk of blockage, and enhancing the sealing between the connecting pipe and the sealing sleeve.

[0019] Preferably, the housing comprises:

[0020] Two side end plates, arranged opposite each other on the left and right;

[0021] Two connecting blocks are arranged opposite each other and positioned between the two side end plates. This design facilitates production and provides necessary support and protection, ensuring the stability and reliability of the equipment and improving its overall performance and service life.

[0022] Preferably, the drive mechanism includes:

[0023] A rotating roller is vertically rotatably installed inside the connecting block;

[0024] A drive motor is installed inside the connecting block and is connected to the rotating roller in a transmission manner;

[0025] Two pull ropes are connected to the ends of the closed sleeve one by one, and pass through the bottom of the movable ring groove into the box body, and are wound up on the rotating roller.

[0026] Multiple guide wheels are rotatably installed inside the housing and cooperate with the pull rope; this solution achieves precise control of the closure sleeve, thereby ensuring the reliability of the closure sleeve's movement and improving the degree of automation and ease of operation.

[0027] Preferably, the connecting block has an internal cavity for accommodating the rotating roller and the drive motor, and a closed door adapted to the cavity is installed on the outside of the connecting block. This solution provides a stable, reliable and easy-to-maintain installation environment, which can prevent dust, debris and other contaminants from entering, while protecting the rotating roller and the drive motor from interference and damage from the external environment.

[0028] Preferably, the lifting mechanism includes:

[0029] A support plate is positioned above the slide plate;

[0030] Multiple support pillars are arranged around the slide plate and positioned between the support plate and the housing;

[0031] The drive cylinder is installed on the top of the support plate, and the drive end is hinged to the top of the slide plate. This solution realizes the height adjustment function of the slide plate and its components, thereby enabling stable and smooth completion of the screen changing operation. It is simple to operate and easy to use.

[0032] Preferably, the upper and lower ends of the slide plate are provided with limiting plates on both sides, and the upper and lower ends of the housing are provided with limiting grooves that match the limiting plates. This solution can accurately limit the travel of the slide plate, ensuring that the filter holes can be accurately aligned with the movable ring groove, thus improving the stability of the device operation.

[0033] Preferably, the outer side of the insert plate is provided with a groove; with this solution, it is easy to pull out the insert plate after installation, while ensuring that it is just embedded in the slide plate, which improves the ease of operation and portability, and ensures a compact structure and sealing effect.

[0034] Through the above technical solution, this utility model achieves the following beneficial effects:

[0035] This application enhances the sealing effect while ensuring automation, preventing material leakage. It also features a locking mechanism to ensure stable operation of the filtration process. Furthermore, the insert plate is easy to install and remove, and the replacement process is simple, facilitating cleaning and maintenance. This not only reduces the difficulty of replacing the filter screen but also shortens the replacement time, thereby improving work efficiency and reducing labor intensity. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a front cross-sectional view of the automatic screen changer for PCR plastic extrusion described in a specific embodiment;

[0038] Figure 2 for Figure 1 The image shows a side cross-sectional view of an automatic screen changer for PCR plastic extrusion.

[0039] Figure 3 for Figure 1 The image shown is a top cross-sectional view of an automatic screen changer for PCR plastic extrusion.

[0040] Figure 4 for Figure 3 The diagram shows a top-view cross-section of the automatic screen changer for PCR plastic extrusion when the seal is broken.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Box body; 1a. Material channel; 1a1. Movable annular groove; 1b. Screen changing channel; 1c. Limiting groove; 2. Slide plate; 3. Insertion plate; 4. Docking structure; 5. Drive mechanism; 6. Lifting mechanism;

[0043] 11. Side end plate; 12. Connecting block; 21. Transfer hole; 22. Limiting plate; 31. Filter hole; 32. Limiting ring; 33. Filter screen; 34. Pull groove; 41. Connecting pipe; 42. Sealing sleeve; 43. Return spring; 51. Rotating roller; 52. Drive motor; 53. Pull rope; 54. Guide wheel; 61. Support plate; 62. Support column; 63. Drive cylinder;

[0044] 121. Receptacle; 122. Sealing door; 411. Flow guide ring groove. Detailed Implementation

[0045] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0046] First, it should be noted that some directional terms used in the following description to clearly illustrate the technical solution of this utility model, such as the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are all derived from the normal orientation of the components in the automatic screen changer for PCR plastic extrusion. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0049] Example:

[0050] like Figures 1-4 As shown in the embodiment of this application, an automatic screen changer for PCR plastic extrusion is disclosed. It is installed at the front end of the extruder to effectively intercept and filter impurities in the recycled material after consumption. Its specific structure includes: a box body 1, a sliding plate 2, two insert plates 3, two docking structures 4, two drive mechanisms 5, and a lifting mechanism 6.

[0051] The housing 1 has a material channel 1a and a screen changing channel 1b that are perpendicular to each other. The material channel 1a is arranged horizontally through the housing and is responsible for the flow of plastic materials. The screen changing channel 1b is arranged vertically through the housing and is used for the movement of the slide plate 2 and the filter components installed on it. The material channel 1a has movable annular grooves 1a1 on both sides inside, which provide the necessary installation space for the docking structure 4.

[0052] The slide plate 2 is slidably installed in the screen changing channel 1b to support the insert plate 3, and has transfer holes 21 at both the upper and lower ends that are adapted to the movable ring groove 1a1 for insertion with the docking structure 4.

[0053] Two insert plates 3 correspond one-to-one with the transfer holes 21 and are inserted into one side of the slide plate 2. Each insert plate 3 has a filter hole 31 that matches the transfer hole 21. A limiting ring 32 is provided in the filter hole 31, and a filter screen 33 is installed in the limiting ring 32 to filter impurities in the plastic material.

[0054] Two docking structures 4 are installed within the material channel 1a and are arranged opposite each other on the left and right sides of the slide plate 2, and each docking structure 4 includes:

[0055] The connecting pipe 41 is embedded at the inlet and outlet of the material channel 1a and extends into the movable annular groove 1a1. It is equipped with a flange on its outer periphery to facilitate docking and sealing.

[0056] The sealing sleeve 42 is slidably fitted onto the connecting pipe 41 and is adapted to the transfer hole 21 and the filter hole 31 to keep the material channel 1b closed.

[0057] The return spring 43 is movably sleeved on the connecting tube 41 and constrained between the end of the closed sleeve 42 and the bottom of the movable annular groove 1a1;

[0058] Two drive mechanisms 5 are installed inside the housing 1 and are arranged opposite each other on the front and rear sides of the slide plate 2, and are connected to the two closed sleeves 42 in a transmission manner.

[0059] The lifting mechanism 6 is installed on the top of the box 1 and is connected to the slide plate 2 via a transmission.

[0060] Specifically, the outer periphery of the end of the connecting pipe 41 closest to the screen switching channel 1b is provided with multiple sealing rings, and the inner periphery of the end of the sealing sleeve 42 furthest from the screen switching channel 1b is provided with multiple sealing rings, thereby improving the sealing performance.

[0061] The working principle of the above technical solution is as follows:

[0062] During installation, connect one connector 41 to the front end of the extruder and the other connector 41 to the output pipe; during the filtration process, such as Figures 1-3 As shown, under the push of the return spring 43, the closed sleeve 42 extends out from the movable ring groove 1a1 and abuts against the limiting ring 32 after passing through the transfer hole 21 and the filter hole 31. It maintains a tight fit with the transfer hole 21, the filter hole 31, and the limiting ring 32. At this time, the slide plate 2 and the insert plate 3 are limited and fixed. Thus, the material enters a connecting pipe 41 from the front end of the extruder, and after being guided by the closed sleeve 42 on that side, it is filtered by the filter screen 33. After being guided by the closed sleeve 42 on the other side, it enters another closed sleeve 42 and is finally sent into the conveying pipe.

[0063] When filter 33 needs to be replaced, such as Figure 4As shown, under the drive of the two drive mechanisms 5, both closed sleeves 42 overcome the rebound force of the return spring 43 and retract into the movable ring groove 1a1. Thus, the closed sleeves 42 will no longer limit the engagement of the slide plate 2 and the insert plate 3. At this time, the lifting mechanism 6 drives the slide plate 2 to move in the screen changing channel 1b until the other transfer hole 21 is aligned with the movable ring groove 1a1. Finally, the drive mechanism 5 is released, and the closed sleeves 42 are reset under the action of the rebound force of the return spring 43.

[0064] When it is necessary to remove or install the insert plate 3, simply pull the insert plate 3 out horizontally from one side of the slide plate 2.

[0065] This utility model, through the above-mentioned settings, can enhance the sealing effect while ensuring automation, preventing raw material leakage, and has a locking effect to ensure stable operation of the filtration process. Furthermore, the insert plate 3 is easy to disassemble and assemble, and the replacement process is simple, making it easy to clean and maintain. It not only reduces the difficulty of replacing the filter screen 33, but also shortens the replacement time, thereby improving work efficiency and reducing labor intensity.

[0066] In some embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, the inner port of the connector 41 is provided with a flow guide groove 411 with a right-angled triangular cross section.

[0067] By setting the flow guide groove 411, the material can be guided to flow in or out more smoothly, which helps to reduce eddies and turbulence in the flow process, thereby improving the stability of the flow, reducing the risk of blockage, and enhancing the sealing between the connecting pipe 41 and the closing sleeve 42.

[0068] In some embodiments, the housing 1 includes two side end plates 11 and two connecting blocks 12; wherein the two side end plates 11 are arranged opposite each other from left to right, and the two connecting blocks 12 are arranged opposite each other from front to back and are disposed between the two side end plates 11, thereby forming a screen changing channel 1b.

[0069] The above settings facilitate production and processing, provide necessary support and protection, ensure the stability and reliability of the equipment, and improve the overall performance and service life of the equipment.

[0070] Based on the above embodiments, such as Figure 2 and Figure 3 As shown, the drive mechanism 5 includes: a rotating roller 51, a drive motor 52, two pull ropes 53, and multiple guide wheels 54, specifically configured as follows:

[0071] The rotating roller 51 is vertically mounted inside the connecting block 12 and serves as a winding and unwinding device for the pull rope 53. The rotation drives the movement of the pull rope 53.

[0072] The drive motor 52 is installed inside the connecting block 12 and is connected to the rotating roller 51 for transmission. It is used to provide power to the rotating roller 51 and drive the rotation of the rotating roller 51 through belts, gears, etc.

[0073] Two pull ropes 53 are connected to the ends of the closed sleeve 42 one by one, and are inserted into the box 1 through the bottom of the movable ring groove 1a1 and wound on the rotating roller 51. Thus, the closed sleeve 42 can be driven to slide on the connecting pipe 41 through the winding and releasing action of the rotating roller 51, thereby achieving locking and separation.

[0074] Multiple guide wheels 54 are rotatably installed inside the housing 1 and cooperate with the pull rope 53 to ensure that the pull rope 53 moves along the correct and smooth path, and to reduce friction and resistance.

[0075] The working principle of the aforementioned drive mechanism 5 is as follows:

[0076] When the filter screen 33 needs to be replaced, the drive motor 52 starts and drives the rotating roller 51 to rotate, so that the pull rope 53 is wound onto the rotating roller 51, thereby pulling the closed sleeve 42 to overcome the elastic force of the reset spring 43 and retract into the movable ring groove 1a1. At this time, the slide plate 2 and the insert plate 3 are no longer limited.

[0077] In summary, the drive mechanism 5, through the coordinated operation of the rotating roller 51, the drive motor 52, the pull rope 53, and the guide wheel 54, achieves precise control of the closed sleeve 42, thereby ensuring the reliability of the movement of the closed sleeve 42 and improving the degree of automation and ease of operation.

[0078] Based on the above embodiments, such as Figure 2 As shown, the connecting block 12 has an internal cavity 121 for accommodating the rotating roller 51 and the drive motor 52, and a closed door 122 adapted to the cavity 121 is installed on the outside of the connecting block 12.

[0079] The above configuration provides a stable, reliable, and easy-to-maintain installation environment for the rotating roller 51 and the drive motor 52, preventing dust, debris, and other contaminants from entering, while protecting the rotating roller 51 and the drive motor 52 from interference and damage from the external environment.

[0080] In some embodiments, such as Figure 1 and Figure 2 As shown, the lifting mechanism 6 includes: a support plate 61, multiple support columns 62, and a drive cylinder 63, specifically configured as follows:

[0081] The support plate 61 is arranged above the slide plate 2 and is used as a load-bearing platform to support the structure or components above it.

[0082] Multiple support columns 62 are arranged around the slide plate 2 and are located between the support plate 61 and the box 1 to provide structural connection between the support plate 61 and the box 1, play a role in stable support, and ensure the smoothness and safety of the lifting action.

[0083] The drive cylinder 63 is installed on the top of the support plate 61, and the drive end is hinged to the top of the slide plate 2. As a power source, it pushes or pulls the slide plate 2 through telescopic movement, thereby realizing the lifting and lowering movement of the slide plate 2.

[0084] The working principle of the above-mentioned lifting mechanism 6 is as follows:

[0085] When the filter screen 33 needs to be replaced, the drive cylinder 63 is activated, and its piston rod extends or retracts, connecting to the slide plate 2 through the hinge point, thereby pushing or pulling the slide plate 2 to move up and down; the movement of the slide plate 2 causes the insert plate 3 on it to rise and fall accordingly, thereby realizing the replacement of the required filter screen 33.

[0086] Through the above design of the lifting mechanism 6, the height adjustment function of the slide plate 2 and its components is realized, thereby enabling stable and smooth completion of the screen changing operation. It is simple to operate and easy to use.

[0087] In some embodiments, such as Figure 1 As shown, the upper and lower ends of the slide plate 2 are equipped with limiting plates 22 on both sides, and the upper and lower ends of the box body 1 are provided with limiting grooves 1c that match the limiting plates 22.

[0088] The combination of the limiting plate 22 and the limiting groove 1c plays a role in precisely limiting the stroke of the slide plate 2, which ensures that the filter hole 31 can be accurately aligned with the movable ring groove 1a1, thereby improving the stability of the device operation.

[0089] In some embodiments, such as Figures 2-4 As shown, a groove 34 is provided on the outer side of the insert plate 3.

[0090] By setting the slot 34, the insert plate 3 can be easily pulled out after installation, while ensuring that it is perfectly embedded in the slide plate 2. This improves the portability of operation and ensures a compact structure and sealing effect.

[0091] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. An automatic screen changer for PCR plastic extrusion, characterized by, The utility model relates to a box body, a material channel and a screen changing channel are perpendicular to each other, the material channel is arranged through laterally, the screen changing channel is arranged through vertically, and the material channel is provided with movable ring grooves on both sides inside, a sliding plate is slidably installed in the screen changing channel, and the upper and lower ends of the sliding plate are respectively provided with transfer holes matched with the movable ring grooves, two plug -in boards are matched with the transfer holes one to one and are inserted on one side of the sliding plate, and the plug -in board is provided with a filter hole matched with the transfer hole, a limiting ring is arranged in the filter hole, and a filter screen is installed in the limiting ring, two docking structures are arranged on the left and right sides of the sliding plate in the material channel, each docking structure comprises a docking pipe embedded in the entrance and exit of the material channel and extending into the movable ring groove, a closed sleeve is slidably sleeved on the docking pipe and matched with the transfer hole and the filter hole, a reset spring is movably sleeved on the docking pipe and constrained between the end of the closed sleeve and the groove bottom of the movable ring groove, two drive mechanisms are arranged on the front and back sides of the sliding plate in the box body and are in transmission connection with the two closed sleeves, and a lifting mechanism is arranged on the top end of the box body and is in transmission connection with the sliding plate. The inner end of the docking pipe is provided with a flow guide ring groove with a right-angled triangle cross section. The box body comprises two side end plates arranged oppositely, and two connecting blocks arranged oppositely and arranged between the two side end plates. The drive mechanism comprises a rotating roller vertically rotatably installed in the connecting block, a drive motor installed in the connecting block and in transmission connection with the rotating roller, two pull ropes connected with the end of the closed sleeve one to one and passing into the box body at the groove bottom of the movable ring groove and being wound on the rotating roller, and a plurality of guide wheels rotatably installed in the box body and matched with the pull ropes. The connecting block is internally provided with an accommodation cavity for accommodating the rotating roller and the drive motor, and the connecting block is externally provided with a closed door matched with the accommodation cavity. The lifting mechanism comprises a support plate arranged above the sliding plate, a plurality of support columns arranged around the sliding plate and arranged between the support plate and the box body, and a drive cylinder installed on the top of the support plate and having a driving end hingedly connected with the top end of the sliding plate. The sliding plate is provided with limiting plates on both sides of the upper and lower ends, and the box body is provided with limiting grooves matched with the limiting plates on the upper and lower ends. The outer side of the plug -in board is provided with a pulling groove. ​ ​ 2. The automatic screen changer for PCR plastic extrusion according to claim 1, characterized in that, ​ 3. The automatic screen changer for PCR plastic extrusion according to claim 1, characterized in that, ​ ​ ​ 4. The automatic screen changer for PCR plastic extrusion according to claim 3, characterized in that, ​ ​ ​ ​ ​ 5. The automatic screen changer for PCR plastic extrusion according to claim 4, characterized in that, ​ 6. The automatic screen changer for PCR plastic extrusion according to claim 1, characterized in that, ​ ​ ​ ​ 7. The automatic screen changer for PCR plastic extrusion according to claim 1, characterized in that, ​ 8. The automatic screen changer for PCR plastic extrusion according to claim 1, characterized in that, ​

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