A dust separator for polyester chips

Abstract

This invention relates to the technical field of polyester chip production equipment, specifically to a dust separator for polyester chips, comprising a sieve cylinder disposed within an outer cylinder and rotatable about its own axis; an interlayer formed between the outer cylinder and the sieve cylinder, the interlayer communicating with the sieve holes to receive dust and debris escaping from the sieve cylinder through the sieve holes; an air outlet is provided on the outer cylinder, communicating with the interlayer; the air outlet is connected to a cyclone separator and an external fan, the external fan being used to draw suction from the interlayer to transport and separate the dust and debris; a weighing hopper is connected to the ash discharge end of the cyclone separator, the weighing hopper being mounted on a weighing sensor for weighing the collected dust and debris and outputting a weighing signal; this invention enables online separation of dust and debris in polyester chips and achieves weight measurement of the collected material through the weighing hopper, avoiding the inefficiency and errors caused by manual sampling.

Description

Technical Field

[0001] This invention relates to the field of polyester chip production equipment technology, specifically to a dust separator for polyester chips. Background Technology

[0002] During the production of polyester chips, large pelletizers inevitably generate dust and fine debris when cutting cast strips into polyester chips. This dust and debris easily adhere to or become trapped in the chips, affecting not only the appearance quality of the chips and subsequent processing performance (e.g., causing breakage and reduced full roll rate during spinning), but also material loss and production efficiency.

[0003] Currently, the industry lacks online dust / fine debris separation and weighing devices for pelletizer outlets or nearby online workstations. Dust levels are often estimated manually by sampling and weighing, which is cumbersome, inefficient, prone to errors, and lacks real-time monitoring capabilities. This makes it difficult to continuously quantify losses during the pelletizing process, hindering process optimization and cost control. Furthermore, existing dust detection equipment is mostly used in gas-solid two-phase flow scenarios such as flues and chemical exhaust gases, typically measuring dust concentration based on infrared transmission and scattering principles. This is ill-suited to the separation and quantitative measurement requirements of "solid chips—dust / fine debris" in polyester chip applications.

[0004] Therefore, there is an urgent need to develop a dust separator for polyester chips to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a dust separator for polyester chips. Through a process link of "rolling and turning of the screen cylinder - screen through the screen holes - negative pressure suction in the jacket - cyclone separation - weighing and metering", the dust and debris can be separated online and continuously weighed and metered from the chips, thereby providing data support for quantifying the loss in the pelletizing stage, optimizing the process and controlling costs.

[0006] To achieve the above objectives, the present invention provides a dust separator for polyester chips, comprising: The outer cylinder and the sieve cylinder disposed inside the outer cylinder and rotatable about its own axis; The screen cylinder has screen holes on its wall, and the two ends of the screen cylinder have a feed inlet and a discharge outlet, respectively; an interlayer is formed between the outer cylinder and the screen cylinder, and the interlayer communicates with the screen holes to receive dust and debris that escape from the screen cylinder through the screen holes; An air outlet is provided on the outer cylinder, and the air outlet is connected to the interlayer; the air outlet is connected to a cyclone separator and an external fan, and the external fan is used to suck up the interlayer to transport and separate the dust and debris; The cyclone separator's ash discharge end is connected to a weighing hopper, which is mounted on a weighing sensor to measure the weight of the collected dust and debris and output a weighing signal.

[0007] Furthermore, an air inlet is provided on the outer cylinder, which is connected to the interlayer and is used to introduce supplementary airflow into the interlayer to adjust the airflow state within the interlayer.

[0008] Furthermore, the inner wall of the sieve cylinder is provided with guide ribs extending along the axial direction of the sieve cylinder to facilitate the axial conveying of polyester chips within the sieve cylinder.

[0009] Furthermore, a feed end plate is provided at the feed inlet of the screen cylinder. A first guide rod is provided on one side of the feed end plate and is slidably connected to the outer cylinder. A first cylinder is provided on the other side of the feed end plate to drive the feed end plate to close or open the feed inlet of the screen cylinder.

[0010] Furthermore, the feed end plate is provided with a sloping guide structure, which allows the incoming polyester chips to slide down the slope and be guided into the screen cylinder.

[0011] Furthermore, a discharge end plate is provided at the discharge port of the screen cylinder. A second guide rod is provided on one side of the discharge end plate and is slidably connected to the outer cylinder body. A second cylinder is provided on the other side of the discharge end plate to drive the discharge end plate to close or open the discharge port of the screen cylinder.

[0012] Furthermore, a filter and protective cover are installed at the air supply port to prevent foreign objects from entering the interlayer. The air supply port is also equipped with a regulating valve to regulate the flow rate of the supplementary airflow.

[0013] Furthermore, the air inlet is arranged circumferentially away from the air outlet within the interlayer.

[0014] Furthermore, the outer cylinder has a motor and a gear on the output shaft of the motor on its outer wall. The end of the screen cylinder has a gear ring, and the outer cylinder has a clearance opening so that the gear ring is partially exposed and meshes with the gear.

[0015] Furthermore, a hinge seat connected to the outer cylinder is provided below the outer cylinder, and a third cylinder drives the outer cylinder to swing along the hinge seat.

[0016] The present invention has the following beneficial effects: 1. It can separate dust and debris in polyester chips online and measure the weight of the collected material through a weighing hopper, avoiding the inefficiency and error caused by manual sampling; 2. By combining the negative pressure suction in the interlayer with the secondary air replenishment at the air inlet, the flow field in the interlayer can be stabilized, the risk of dust and debris falling back and escaping can be reduced, and the stability of dust conveying can be improved without significantly increasing the accidental removal of slices. 3. By rotating the screen cylinder and turning the material, and with the action of the axial guide ribs, the dust desorption and screening probability are improved, and the slice residence time and discharge cycle are stabilized. 4. Through the end plate opening and closing mechanism and the tilt angle adjustment mechanism, segmented processing can be realized, which can change the axial conveying trend and residence time of the slices in the screen cylinder, thereby adjusting the desorption and screening opportunities within a certain range, improving the adaptability to changes in working conditions, and the tilt angle adjustment also facilitates feeding or discharging assistance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 AA direction view; Figure 4 This is a schematic diagram of the feed end plate of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; The numbers on the map are: 1-Outer cylinder; 2-Screen hole of screen cylinder; 3-Interlayer; 4-Air outlet; 5-Air inlet; 6-Regulating valve; 7-Filter screen; 8-Protective cover; 9-Guide rib; 10-Motor; 11-Gear; 12-Gear ring; 13-Feed end plate; 14-Discharge end plate; 15-First guide rod; 16-First cylinder; 17-Second guide rod; 18-Second cylinder; 19-Hinge seat; 20-Third cylinder. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] This invention proposes a dust separator for polyester chips, such as... Figures 1 to 5 As shown, its overall structure consists of an outer cylinder 1 and a sieve cylinder arranged coaxially as a drum-type separation unit. The sieve cylinder serves as the main channel for carrying the slices, while the outer cylinder 1 serves as the supporting structure for the outer shell and the negative pressure dust collection chamber. An annular interlayer 3 is formed between the sieve cylinder and the outer cylinder 1. The interlayer 3 is connected to an external cyclone separator and an external fan through an air outlet 4, forming a stable negative pressure suction condition. This device can be installed at the pelletizer outlet or the online station of the slice conveying section. Through the tumbling and desorption of the slices, their discharge through the sieve, and negative pressure suction conveying, the separation of dust and debris from the slices is achieved, and the weight of the collected material is measured through a weighing hopper.

[0022] The outer cylinder 1 is a closed shell structure with an air outlet 4. The air outlet 4 is connected to the interlayer 3 and to the cyclone separator and external fan (not shown in the figure). The external fan is preferably arranged as an induced draft fan / negative pressure fan, which establishes a stable negative pressure field in the interlayer 3 by drawing air from it. The interlayer 3 is used to receive dust and debris escaping from the screen holes 2 of the screen cylinder and transport them to the cyclone separator under the action of airflow. The cyclone separator is used to achieve gas-solid separation, and its ash discharge end is connected to a weighing hopper. The weighing hopper is set on a weighing sensor (not shown in the figure) to continuously collect the weight of the hopper and output a weighing signal. The weighing signal can be used to calculate the amount of dust and debris collected per unit time, thereby quantifying the pelletizing loss; furthermore, during the processing of this section of polyester chips, based on whether the change in the weighing signal within a preset time window is less than a preset threshold, it is determined whether the dust removal stage of this section of polyester chips is completed.

[0023] The sieve cylinder is a rotatable perforated cylinder with sieve holes evenly distributed on its wall. The size of the sieve holes is selected according to the target slice specifications and the particle size range of the dust and debris to be separated, generally meeting the basic principle of "dust and debris can pass through the sieve, but slices cannot." An inlet and an outlet are respectively provided at both ends of the sieve cylinder. An inlet end plate 13 can be installed at the inlet, and an outlet end plate 14 can be installed at the outlet. A first guide rod 15 is provided on one side of the inlet end plate 13, which is slidably connected to the outer cylinder 1 to constrain the movement trajectory of the end plate; a first cylinder 16 is provided on the other side to drive the inlet end plate 13 to reciprocate relative to the inlet of the sieve cylinder, thereby opening or closing the inlet. Preferably, the inlet end plate 13 is provided with a sloping guiding structure, so that the slices enter through the inlet and slide down the slope into the inner cavity of the sieve cylinder. A second guide rod 17 is provided on one side of the discharge end plate 14 and is slidably connected to the outer cylinder 1. A second cylinder 18 is provided on the other side to drive the discharge end plate 14 to close or open the discharge port of the screen cylinder.

[0024] The sieve cylinder can be driven by an external motor 10, gear 11, and gear ring 12. The outer wall of the outer cylinder 1 houses the motor 10 and the gear 11 located on the output shaft of the motor 10. A gear ring 12 is located at the end of the sieve cylinder. An opening is provided on the outer cylinder 1 to expose part of the gear ring 12, allowing it to mesh with the gear 11. The output of the motor 10 drives the sieve cylinder to rotate via the gear 11 and gear ring 12. The rotation of the sieve cylinder creates a tumbling and frictional environment inside the drum, causing the slices to continuously tumble, fall, and roll within the cylinder, thus achieving a "desorption" effect on the dust and debris on the slice surface. To improve the axial conveying stability of the slices, axially extending guide ribs 9 can be provided on the inner wall of the sieve cylinder. The guide ribs 9 can be strip-shaped ribs, strip-shaped convex ribs, or corrugated ribs, and can be continuously or segmented. Specific parameters can be determined according to the slice specifications and processing volume.

[0025] The separation and conveying process of dust and debris begins inside the screen cylinder. Under the rotational tumbling action, dust and debris detach from the surface and, under the influence of gravity, centrifugal force, and material layer disturbance, contact the inner wall of the screen cylinder. When the dust and debris particle size is smaller than the screen aperture, it can pass through the screen and enter the interlayer 3, forming primary solid-solid separation. Subsequently, the interlayer 3, under the suction of an external fan, forms a negative pressure and airflow channel. The dust and debris that have passed through the screen are carried by the airflow and conveyed through the outlet 4 to the cyclone separator to complete gas-solid separation. Finally, it falls from the ash discharge end into the weighing hopper for weighing. Compared with collection methods that rely solely on gravity settling, negative pressure suction significantly reduces the risk of dust and debris remaining inside the equipment and re-entering, improving the stability and continuity of online separation.

[0026] To improve airflow organization and stable suction in the interlayer 3, an air inlet 5 is provided on the outer cylinder 1, which is connected to the interlayer 3. A filter screen 7 and a protective cover 8 can be installed at the air inlet 5 to prevent foreign objects from entering the interlayer 3; an regulating valve 6 can also be installed at the air inlet 5 to adjust the supplementary airflow rate. The air inlet 5 can function in the following scenarios: when the negative pressure in the interlayer 3 is too strong, causing an increase in the suction gradient at the sieve holes, appropriate air supplementation can reduce the local suction peak and reduce the probability of slices or larger debris being carried into the interlayer 3; when the negative pressure in the interlayer 3 is too low, adjusting the air supplementation flow rate and position can improve the airflow uniformity in the interlayer 3 and improve the stability of dust and debris transport; when it is necessary to clean the interlayer 3 or reduce dust retention, the supplementary air can act as a secondary air source to assist in moving the dust and debris in the interlayer 3 towards the outlet 4. To enhance this effect, the air inlet 5 can be arranged circumferentially away from the air outlet 4 within the interlayer 3, so that the air supply airflow and the suction airflow form a more reasonable streamline distribution within the interlayer 3.

[0027] To improve and adapt to different slice sizes, processing volumes, or dust levels, this device can also be equipped with a tilt adjustment mechanism. A hinged seat 19 is located below the outer cylinder 1 and connected thereto, and a third cylinder 20 drives the outer cylinder 1 to swing along the hinged seat 19. By adjusting the tilt angle of the outer cylinder 1, the axial conveying trend and residence time of the slices within the sieve cylinder can be changed, thereby adjusting the desorption and screening opportunities within a certain range, improving adaptability to changes in operating conditions. The tilt angle adjustment also facilitates feeding or discharging assistance.

[0028] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0029] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A dust separator for polyester chips, characterized in that, include: The outer cylinder and the sieve cylinder disposed inside the outer cylinder and rotatable about its own axis; The screen cylinder has screen holes on its wall, and the two ends of the screen cylinder have a feed inlet and a discharge outlet, respectively; an interlayer is formed between the outer cylinder and the screen cylinder, and the interlayer communicates with the screen holes to receive dust and debris that escape from the screen cylinder through the screen holes; An air outlet is provided on the outer cylinder, and the air outlet is connected to the interlayer; the air outlet is connected to a cyclone separator and an external fan, and the external fan is used to suck up the interlayer to transport and separate the dust and debris; The cyclone separator is connected to a weighing hopper at its ash discharge end. The weighing hopper is mounted on a weighing sensor and is used to weigh the collected dust and debris and output a weighing signal.

2. A dust separator for polyester chips according to claim 1, characterized in that, An air inlet is provided on the outer cylinder, and the air inlet is connected to the interlayer to introduce supplementary airflow into the interlayer to adjust the airflow state within the interlayer.

3. A dust separator for polyester chips according to claim 1, characterized in that, The inner wall of the sieve cylinder is provided with guide ribs extending along the axial direction of the sieve cylinder to facilitate the axial conveying of polyester chips within the sieve cylinder.

4. A dust separator for polyester chips according to claim 1, characterized in that, The screen cylinder is provided with a feed end plate at the feed inlet. A first guide rod is provided on one side of the feed end plate and is slidably connected to the outer cylinder. A first cylinder is provided on the other side of the feed end plate to drive the feed end plate to close or open the screen cylinder feed inlet.

5. A dust separator for polyester chips according to claim 4, characterized in that, The feed end plate is provided with a sloping guide structure, which is used to allow the incoming polyester chips to slide down the slope and be guided into the screen cylinder.

6. A dust separator for polyester chips according to claim 1, characterized in that, The screen cylinder is provided with a discharge end plate at the discharge port. A second guide rod is provided on one side of the discharge end plate and is slidably connected to the outer cylinder. A second cylinder is provided on the other side of the discharge end plate to drive the discharge end plate to close or open the screen cylinder discharge port.

7. A dust separator for polyester chips according to claim 2, characterized in that, A filter and a protective cover are installed at the air supply port to prevent foreign objects from entering the interlayer. The air supply port is also equipped with a regulating valve to adjust the flow rate of the supplementary airflow.

8. A dust separator for polyester chips according to claim 2, characterized in that, The air inlet is located circumferentially away from the air outlet within the interlayer.

9. A dust separator for polyester chips according to claim 1, characterized in that, The outer cylinder has a motor and a gear on the output shaft of the motor on its outer wall. The end of the screen cylinder has a gear ring. The outer cylinder has a clearance opening so that the gear ring is partially exposed and meshes with the gear.

10. A dust separator for polyester chips according to claim 1, characterized in that, The outer cylinder is provided with a hinge seat connected to it at the bottom, and a third cylinder that drives the outer cylinder to swing along the hinge seat.

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