Polyolefin catalyst screening apparatus

Abstract

This utility model relates to the field of screening technology and discloses a polyolefin catalyst screening device. The device includes a screening body, an ultrasonic generator, and an ultrasonic transducer. The screening body includes a screen plate with a surrounding screen frame. A viewing window is provided on the screen frame. A mesh frame located within the screen frame and used to support the screen mesh is connected to the ultrasonic transducer, which is electrically connected to the ultrasonic generator. This utility model offers advantages such as visualization, reduced disassembly and assembly of the screen body for inspection, prevention of catalyst exposure and corrosion of the screen mesh, and extended screen mesh service life.

Description

Technical Field

[0001] This utility model relates to the field of screening technology, and specifically to a polyolefin catalyst screening device. Background Technology

[0002] Polyolefin catalysts consist of titanium compounds and electron donor compounds supported on an active magnesium halide support. A common active magnesium halide support is an adduct of magnesium halide and alcohol, usually in the form of spherical particles.

[0003] In the production process of polyolefin catalysts, the screening and discharge of finished catalysts is the final and crucial step in the production process. The granular catalyst is screened by vibration to separate catalysts that do not meet the product particle size requirements, while retaining catalyst particles that meet the requirements. Traditional screening equipment uses a simple screen for screening. After each batch of catalyst is screened, the operator needs to disassemble the screen to check for damage. If there is damage, the screen will be replaced and the same batch of catalyst will be screened again, which increases the labor intensity. At the same time, the exposed catalyst will deliquesce and cause pollution to the surrounding environment and the equipment itself. Utility Model Content

[0004] The purpose of this invention is to overcome the problem that operators cannot observe the state of the screen during the screening process in existing screening equipment and methods. It provides a polyolefin catalyst screening device with advantages such as visualization, reduced disassembly and assembly of the screen body for inspection, prevention of catalyst exposure and corrosion of the screen, and extension of the screen's service life.

[0005] To achieve the above objectives, this utility model provides a polyolefin catalyst sieving device, which includes a sieving device body, an ultrasonic generator, and an ultrasonic transducer. The sieving device body includes a sieve disc, which has a sieve frame formed around it, and a viewing window is provided on the sieve frame.

[0006] The mesh frame located in the sieve frame and used to support the sieve mesh is connected to the ultrasonic transducer, and the ultrasonic transducer is electrically connected to the ultrasonic generator.

[0007] In some embodiments, the space frame includes a plurality of concentrically arranged resonant rings, with supporting ribs connecting adjacent resonant rings.

[0008] In some embodiments, each of the support ribs extends from the inside of the grid frame to the outside and is connected to the resonant rings of each layer in sequence, and multiple support ribs are provided at equal intervals along the circumference of the grid frame.

[0009] In some implementations, the grid structure is connected to a ground wire.

[0010] In some embodiments, the viewing window is located on one side of the sieve frame and has a non-stick coating.

[0011] In some embodiments, the screening device body has a plurality of screen discs sealed and stacked along the height direction, and the screen frames of two adjacent screen discs are connected by a sealed flange structure.

[0012] In some embodiments, the upper and lower flange surfaces that come into contact with each other in the sealing flange structure are provided with grooves, which are used to install the space frame.

[0013] In some implementations, a retaining ring is fixed at the connection between two adjacent screen frames.

[0014] In some embodiments, the clamping ring is a silicone sealing ring.

[0015] In some embodiments, the discharge port of the polyolefin catalyst screening device is provided with a discharge tray on which a weighing device is installed.

[0016] Through the above technical solution, this utility model has a viewing window on the screen frame, which can realize the visualization of polyolefin catalyst screening, reduce the disassembly and assembly of the screen body to inspect the screen, avoid catalyst exposure and corrosion of the screen, extend the service life of the screen, and superimpose ultrasonic vibration waves, so that the ultrafine powder receives huge ultrasonic acceleration, keeping the material on the screen surface in a suspended state, thereby suppressing the factors of screen clogging and ensuring the stability of product quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the polyolefin catalyst screening device according to a specific embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A schematic diagram of the central grid structure.

[0019] Explanation of reference numerals in the attached figures

[0020] 1. Base; 2. Vibrating motor; 3. Screen plate; 4. Mesh frame; 5. Dust cover; 6. Binding ring; 7. Spring; 8. Transport fixing bolt; 21. Lower counterweight; 22. Upper counterweight; 23. Counterweight block; 31. Discharge port; 41. Screen; 42. Resonance ring; 43. Support rib; 51. Feed port. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0022] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used to describe the relative positions of components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions.

[0023] With existing screening equipment and methods, operators cannot observe the condition of the screen online during the screening process. They can only check the screen after screening by disassembling the screen. Catalyst particles remaining on the screen will quickly deliquesce upon exposure to air, causing damage to the equipment and the surrounding environment. At the same time, the system needs to be kept airtight during screening. The existing screen sealing method uses grooved rubber gaskets and snap-fit ​​fixing. Frequent disassembly and inspection of the screen can also easily lead to aging and cracking of the gaskets, causing catalyst leakage during screening, affecting product quality and the yield of catalyst per batch.

[0024] This utility model provides a polyolefin catalyst screening device, which includes a screening device body. The screening device body has a screen plate 3 with a screen frame formed around it. A viewing window is provided on the screen frame. In this way, the screen can be checked through the viewing window without disassembling the screen plate, and the screen plate can be frequently disassembled and inspected.

[0025] like Figure 1As shown, the main body of the screening device of this utility model includes a base 1. The base 1 and the screen plate are connected by a spring 7 and a transport fixing bolt 8. The bottom of the screen plate is sunk into the base 1 for installing a vibrating motor 2. The vibrating motor 2 is used to transmit vibration force. It can be a conventional vibrating motor or an explosion-proof vibrating motor with a lower counterweight 21, an upper counterweight 22 and a counterweight 23 in the field of vibrating screening machines. The screen plate is located above the base 1 and has at least one of the aforementioned screen plates 3. Each screen plate 3 has a discharge port 31 on its screen frame. A dust cover 5 is sealed on the uppermost screen frame. The top of the dust cover 5 has a feed inlet 51. The polyolefin catalyst screening device is also equipped with an ultrasonic controller, an ultrasonic generator, and an ultrasonic transducer. A screen frame 4 located within the screen frame is used to install the screen 41. Different screen sizes and materials can be selected as needed. The screen frame 4 is connected to the ultrasonic transducer, which is electrically connected to the ultrasonic generator. The ultrasonic generator is electrically connected to the ultrasonic controller. The ultrasonic generator generates high-frequency ultrasonic vibrations to improve screening efficiency. The ultrasonic transducer converts electrical energy into ultrasonic vibration energy, which is transmitted to the screening surface, causing the material to vibrate slightly during screening. The ultrasonic controller controls the vibration frequency, amplitude, and other parameters to achieve precise control of the screening process. Thus, a high-frequency, low-amplitude ultrasonic vibration wave can be superimposed on the screen 41. The ultrafine powder receives a huge ultrasonic acceleration, keeping the material on the screen surface in a suspended state, thereby suppressing clogging factors such as adhesion, friction, settling, and wedging, achieving clean screening and solving screening problems related to strong adsorption, easy agglomeration, high static electricity, high fineness, high density, and low specific gravity.

[0026] Among them, such as Figure 2 As shown, the space frame 4 includes multiple concentric circular resonant rings 42, and a supporting rib 43 is welded between two adjacent resonant rings 42.

[0027] Specifically, each support rib 43 extends from the inside of the space frame 4 outward and connects sequentially to the resonant rings 42 of each layer. Multiple support ribs 43 are evenly spaced along the circumference of the space frame 4, which can be arranged as follows: Figure 2 As shown, four symmetrical support ribs forming a cross are arranged. In ultrasonic vibrating screening, the screen frame 4 of the screen 41 is an important component that supports the transmission frequency of the transducer transmission rod in the ultrasonic screening system, and it is also an important component that supports the screen. In this utility model, the screen frame 4 adopts three circular resonant rings 42 inside, and the resonant rings are connected by cross support ribs. This structural design can effectively and evenly transmit the ultrasonic vibration frequency, greatly improve the screen penetration rate, reduce screen damage caused by screen blockage, and the circular resonant rings can also increase the load-bearing capacity of the screen, which can effectively improve the screen strength and service life.

[0028] It should be noted that there is a static electricity problem when ultrasonically screening spherical particles. In this invention, the mesh frame 4 is connected to the ground wire. Specifically, the screen frame and the mesh frame 4 are in close contact. When connecting the ground wire, it can be directly spot-welded to the screen frame so that the current can be conducted into the grounding grid.

[0029] In this invention, observation windows with a diameter of φ200 can be opened on both sides of the sieve frame corresponding to the sieve mesh. The viewing window is located on one side of the sieve frame and is coated with a non-stick coating. The non-stick coating is made of nanomaterials. Nanomaterials refer to materials whose structural units have a size between 1 nanometer and 100 nanometers. Since its size is close to the coherence length of electrons, coupled with its special effect of large surface area, it exhibits good antistatic, anti-corrosion and non-stick properties, making the nano-coating a good non-stick dust material, while also being transparent.

[0030] To increase throughput and / or achieve better grading, the number of sieve discs can be increased. Specifically, the main body of the screening device can have multiple sieve discs of the present invention that are sealed and stacked along the height direction. The sieve frames of two adjacent sieve discs can be connected by a sealing flange structure to achieve closed screening. Specifically, the upper and lower edges of the sieve frame are set as flange plates. Two adjacent sieve frames can be connected by flange plates and gaskets can be installed as needed. Alternatively, the upper and lower edges of two adjacent sieve frames can be formed as matching V-shaped concave and convex flange structures, and the internal flanges can achieve a sealing effect after docking.

[0031] Furthermore, in the sealing flange structure formed by two adjacent screen frames, grooves are respectively provided on the contacting upper and lower flange surfaces. These grooves are used to install the screen frame 4. The screen frame 4 is provided with a mounting part that matches the groove. For example, the groove is an annular shape, and the mounting part is also designed as an annular shape that can be placed in the groove to connect the resonance ring 42 or the support rib 43. In this way, the screen frame 4 can be replaced simply by inserting it. Compared with the original disassembly and bolt fixing method, the screen can be quickly replaced according to the particle size of the catalyst particles.

[0032] To achieve a fixed tension effect, the connection between two adjacent screen frames is fixed by a 6-phase clamping ring. Thus, the screen disc is externally tensioned by a clamping ring tensioning structure, and the screen disc is tightened and compacted by the clamping ring belt.

[0033] Among them, the clamping ring 6 can be a silicone sealing ring, such as a hexane-resistant sealing ring.

[0034] The discharge port 31 of the polyolefin catalyst screening device is equipped with a discharge tray with a weighing device, which can measure the weight of the discharged material. The weighing device can also be a measuring device that can provide real-time feedback of the discharged weight or an ordinary measuring device, such as an electronic scale. This utility model has no special requirements in this regard and will not be described in detail.

[0035] This utility model's polyolefin catalyst screening device enables visualized and sealed screening and discharge of polyolefin catalysts, facilitating screen replacement and ensuring product quality stability. It reduces the need for disassembling and inspecting the screen, preventing catalyst exposure and corrosion, and extending screen lifespan. Real-time weighing of the finished catalyst product reduces labor and maintenance costs.

[0036] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A polyolefin catalyst sieving device, characterized in that, The polyolefin catalyst screening device includes a screening device body, an ultrasonic generator and an ultrasonic transducer. The screening device body includes a screen plate (3), the screen plate (3) has a screen frame formed around it, and the screen frame has a viewing window. The mesh frame (4) located in the sieve frame and used to support the sieve mesh (41) is connected to the ultrasonic transducer, and the ultrasonic transducer is electrically connected to the ultrasonic generator. The space frame (4) includes multiple concentrically arranged resonant rings (42), and a supporting rib (43) connects two adjacent resonant rings (42). The space frame (4) is connected to the ground wire; The viewing window is located on one side of the sieve frame and is coated with a non-stick coating. The main body of the screening device has multiple screen discs that are sealed and stacked along the height direction, and the screen frames of two adjacent screen discs are connected by a sealed flange structure. The sealing flange structure has grooves on the upper and lower flange surfaces that are in contact with each other, and the grooves are used to install the space frame (4).

2. The polyolefin catalyst screening device according to claim 1, characterized in that, Each of the support ribs (43) extends from the inside of the grid frame (4) to the outside and is connected to the resonant rings (42) of each layer in sequence. Multiple support ribs (43) are provided at equal intervals along the circumference of the grid frame (4).

3. The polyolefin catalyst screening device according to claim 1, characterized in that, A retaining ring (6) is fixed at the connection between two adjacent screen frames.

4. The polyolefin catalyst screening device according to claim 3, characterized in that, The clamping ring (6) is a silicone sealing ring.

5. The polyolefin catalyst screening device according to claim 1, characterized in that, The outlet (31) of the polyolefin catalyst screening device is equipped with a discharge tray for installing a weighing device.

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