Screen exchanger with sealing ring with reinforcing structure for reducing dead material area

Abstract

The utility model provides a screen exchanger with a sealing ring with a reinforcing structure for reducing dead material areas, which relates to the technical field of plastic processing and comprises a shell, a sealing ring, a sealing ring and a sealing ring, a flow dividing cavity is formed in the shell, a slide way is formed in the flow dividing cavity, and the slide way penetrates through the inner wall of the flow dividing cavity to the outer side of the shell; the sliding plate is arranged on the sliding way, two sets of perforated plates are arranged on the surface of the sliding plate, and the sliding plate divides the flow dividing cavity into a flow inlet channel and a flow outlet channel; the pre-tightening device and the sliding plate are arranged on the inner wall of the flow dividing cavity in parallel, a containing cavity is formed in the surface, close to the flow dividing cavity, of the pre-tightening device, and an inlet pre-tightening spring is arranged in the containing cavity. Certain pre-tightening force can be applied to the sliding plate through the pre-tightening spring, so that a good sealing state is kept between the sliding plate and the inner wall of the flow dividing cavity, material leakage is prevented, and the stability and reliability of the screen exchanger during working are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing technology, and more specifically, to a screen changer with a reinforced sealing ring that reduces dead material zone. Background Technology

[0002] In the extrusion processing of polymer materials such as plastics and rubber, screen changers are indispensable key equipment. Their main function is to filter impurities, unmelted particles, and other foreign matter from the melt, ensuring the quality and performance of the final product. With the rapid development of the polymer material processing industry, the market demands increasingly higher precision, purity, and production efficiency for products, posing more stringent challenges to the performance of screen changers.

[0003] Traditional screen changers face several pressing problems in practical applications. Firstly, their internal structure is poorly designed, easily creating dead material zones. In areas such as the flow distribution chamber and sealing parts, material flow is obstructed, leading to prolonged material retention. This not only wastes raw materials but also generates impurities due to high-temperature oxidation and degradation, contaminating subsequent materials and affecting product quality. Secondly, their sealing performance is insufficient. Existing sealing rings are prone to wear and deformation under high-temperature and high-pressure operating environments, resulting in melt leakage. This not only causes material loss but may also lead to safety accidents. Furthermore, leaked material contaminates equipment, increasing maintenance costs and downtime. In addition, replacing the filter screen in traditional screen changers is complex and time-consuming, resulting in low production efficiency and making it difficult to meet the demands of large-scale continuous production.

[0004] Therefore, there is an urgent need for a screen changer with a reinforced sealing ring that reduces dead material zone to replace the traditional screen changer, in order to solve the problems of how to reduce material retention and improve sealing performance. Utility Model Content

[0005] In view of this, the present invention proposes a screen changer with a reinforced sealing ring that reduces dead material zone, aiming to solve the problems of how to reduce material retention and improve sealing performance.

[0006] This utility model provides a screen changer with a reinforced sealing ring that reduces dead material zone, comprising:

[0007] The housing has a flow-dividing cavity inside, and a slide is provided in the flow-dividing cavity perpendicular to the center line. The slide passes through the inner wall of the flow-dividing cavity to the outside of the housing. Several placement slots are provided inside the housing.

[0008] A slide plate is mounted on a slide rail. The surface of the slide plate is provided with two sets of perforated plates. The slide plate divides the flow distribution cavity into an inlet channel and an outlet channel.

[0009] A pre-tightening device is arranged parallel to the slide plate on the inner wall of the diversion cavity. A pre-tightening end is provided on the outer side of the pre-tightening device. Several inlet pre-tightening springs are provided on the surface of the pre-tightening end near the housing. The positions of the several inlet pre-tightening springs correspond to the placement grooves. The side of the pre-tightening device near the slide plate is slidably connected to the slide plate.

[0010] Furthermore, the housing includes an inlet plate, an outlet plate, and a gasket. The inlet plate and the outlet plate correspond to the inlet channel and the outlet channel, respectively. The gasket is disposed between the inlet plate and the outlet plate. The surface of the inlet plate has a feed inlet, and the surface of the outlet plate has a discharge outlet. The inlet plate, the outlet plate, and the gasket are bolted together.

[0011] Furthermore, an inlet melting and pressing activation zone is provided between the inlet plate and the pre-tightening device.

[0012] Furthermore, an inlet diverter is provided on the side of the inlet channel away from the feed inlet, and an inlet diverter rib is provided at the center of the radius on the side of the inlet diverter close to the feed inlet. The inlet diverter ribs are radially distributed with the center line of the inlet channel as the center, and an inlet diverter torpedo head is obliquely connected to the end of the inlet diverter rib away from the inlet diverter.

[0013] Furthermore, an outlet diverter is provided on the side of the outlet channel away from the discharge port. An outlet diverter rib is provided at the center of the radius on the side of the outlet diverter near the discharge port. The outlet diverter ribs are radially distributed with the center line of the outlet channel as the center. An outlet diverter torpedo head is obliquely connected to the end of the outlet diverter rib away from the outlet diverter. An outlet static sealing ring is provided between the side of the slide plate away from the inlet channel and the outlet plate. The outlet static sealing ring is slidably connected to the slide plate.

[0014] Furthermore, a filter screen is provided on the side of the perforated plate near the feed inlet, and the filter screen is connected to the perforated plate through a screen pressing component. A connecting end plate is provided on the side of the slide plate away from the inlet plate and the outlet plate, and a receiving groove is provided inside the connecting end plate.

[0015] Furthermore, the sides of the inlet plate and outlet plate are connected to double-headed bolt supports parallel to the slide plate, and the end of the double-headed bolt support away from the inlet plate and outlet plate is connected to a fixing plate, and the surface of the fixing plate is provided with through holes.

[0016] Furthermore, a hydraulic cylinder is provided on the side of the fixing plate away from the inlet plate and the outlet plate. The hydraulic cylinder is equipped with a piston rod, which passes through a through hole and is connected to the sliding plate.

[0017] Furthermore, a ball head is provided at the end of the piston rod away from the oil cylinder, and the ball head is disposed inside the receiving groove.

[0018] Furthermore, both the inlet plate and the outlet plate are equipped with heat medium flow channels.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. The design of the sliding plate and the slide rail makes filter replacement simple and convenient. When the filter on the perforated plate needs to be replaced due to prolonged use or blockage, the operator only needs to pull the sliding plate along the slide rail to quickly disassemble and install a new perforated plate, which greatly shortens the filter replacement time, reduces equipment downtime, improves production efficiency, and fits the continuous and efficient production rhythm of modern industry.

[0021] 2. The pre-tightening device, through an imported pre-tightening spring, continuously provides a stable pre-tightening force to the slide plate. This pre-tightening force ensures a tight fit between the slide plate and the inner wall of the diversion chamber, effectively preventing melt leakage during high-temperature, high-pressure material transfer and ensuring the sealing and reliability of the screen changer operation.

[0022] 3. The rational design of the flow divider and slide plate structure, combined with the pre-tightening device, optimizes the flow path of materials within the screen changer, greatly reducing areas of poor material flow and effectively preventing the formation of dead zones. This not only reduces raw material waste but also prevents deterioration and degradation caused by long-term material retention, lowers the risk of impurities contaminating the material, ensures the stability of material quality, and further improves product quality. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0024] Figure 1 This is a schematic diagram of the structure of the screen switch provided in an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0026] Figure 3 for Figure 1 Cross-sectional view along the BB direction.

[0027] In the diagram: 100-Shell; 110-Outlet plate; 111-Discharge port; 112-Outlet diverting torpedo head; 113-Outlet channel; 114-Outlet diverting rib; 120-Push strip; 130-Inlet plate; 131-Inlet melting and pressing activation zone; 132-Inlet; 133-Inlet diverting torpedo head; 134-Inlet channel; 135-Inlet diverting rib; 140-Heat medium channel; 200-Slide plate; 210-Connecting end plate; 300-Hydraulic cylinder; 310-Ball head; 400-Fixing plate; 410-Double-headed bolt support; 500-Perforated plate; 510-Filter screen; 520-Pressing screen component; 600-Pre-tightening device; 610-Inlet pre-tightening spring; 700-Outlet static sealing ring. Detailed Implementation

[0028] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0029] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element 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 application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] See Figure 1 and Figure 2As shown, this embodiment provides a screen changer with a reinforced sealing ring that reduces dead material area, including: a housing 100, which has a flow-diverting cavity inside, and a slide rail is provided in the flow-diverting cavity in a direction perpendicular to the center line. The slide rail passes through the inner wall of the flow-diverting cavity to the outside of the housing 100. The housing 100 is provided with a plurality of placement grooves inside.

[0033] The slide plate 200 is set on the slide rail. The surface of the slide plate 200 is provided with two sets of perforated plates 500. The slide plate 200 divides the flow distribution cavity into an inlet channel 134 and an outlet channel 113.

[0034] A pre-tightening device 600 is arranged parallel to the slide plate 200 on the inner wall of the diversion cavity. A pre-tightening end is provided on the outer side of the pre-tightening device 600. A plurality of inlet pre-tightening springs 610 are provided on the surface of the pre-tightening end near the housing 100. The positions of the plurality of inlet pre-tightening springs 610 correspond to the placement grooves. The side of the pre-tightening device 600 near the slide plate 200 is slidably connected to the slide plate.

[0035] Specifically, by arranging the imported preload spring 610 outside the sealing surface of the housing 100 and the preload device 600, dead material in the spring structure and the cavity can be completely eliminated.

[0036] Specifically, the flow divider has a cylindrical structure, which allows the material to be evenly dispersed within the cavity, ensuring the stability of the material flow.

[0037] Understandably, the slide plate 200 divides the flow chamber into an inlet channel 134 and an outlet channel 113, causing the material to flow in a directional manner within the inlet channel 134.

[0038] Understandably, the pre-tightening device 600 is made of a special shape memory alloy. Before startup, the pre-tightening device 600 is at room temperature, and the main pre-tightening spring provides basic pressure, causing the slide plate 200 to fit against the inner wall of the distribution chamber, forming an initial seal. When the equipment is running, the heating program is activated, and the pre-tightening device 600 expands upon heating, compressing the inlet pre-tightening spring 610. The inlet pre-tightening spring 610 then evenly transmits the pre-tightening force to the slide plate 200. As the temperature rises, the expansion of the pre-tightening device 600 increases, and the spring compression increases simultaneously, achieving a dynamic increase in pre-tightening force.

[0039] In some embodiments of this application, the housing 100 includes an inlet plate 130, an outlet plate 110, and a gasket 120. The inlet plate 130 and the outlet plate 110 correspond to the inlet channel 134 and the outlet channel 113, respectively. The gasket 120 is disposed between the inlet plate 130 and the outlet plate 110. The surface of the inlet plate 130 is provided with a feed inlet 132, and the surface of the outlet plate 110 is provided with a discharge outlet 111. The inlet plate 130, the outlet plate 110, and the gasket 120 are bolted together.

[0040] Specifically, the gasket 120 is positioned between the inlet plate 130 and the outlet plate 110, serving a dual function of support and sealing. The gasket 120 is made of high-temperature and high-pressure resistant rubber or special engineering plastics, possessing good elasticity and flexibility.

[0041] Understandably, the imported plate 130, the exported plate 110, and the gasket 120 are connected by bolts, a method that offers convenient disassembly and a secure connection. The bolts are made of high-strength alloy steel and undergo rust-proofing treatment to ensure good tightening performance even in harsh environments such as high temperature and humidity. During the bolt connection process, a symmetrical, step-by-step tightening method is used to ensure even force distribution on the imported plate 130, exported plate 110, and gasket 120, preventing seal failure due to uneven force. Furthermore, spring washers and flat washers are installed under the bolt heads and nuts. The spring washers prevent the bolts from loosening during equipment vibration, while the flat washers increase the contact area between the bolts and the connected parts, distributing pressure and protecting the surfaces of the connected components from damage.

[0042] In some embodiments of this application, an inlet melting and pressing activation zone 131 is provided between the inlet plate 130 and the pre-tightening device 600.

[0043] Understandably, the inlet channel 134 and outlet channel 113 create directional flow of material within the inlet channel 134, providing stable material input conditions for the inlet melting and pressing activation zone 131. When the material flows through this zone, the pre-tightening device 600 works in conjunction with the material pressure to create a localized high-pressure environment. This high pressure effectively activates the material's flowability, reduces its viscosity, and makes it easier to pass through the porous plate 500 for filtration. It is particularly suitable for processing high-viscosity materials, greatly improving material filtration efficiency and quality.

[0044] In some embodiments of this application, an inlet diverter is provided on the side of the inlet channel 134 away from the feed inlet 132, and an inlet diverter rib 135 is provided at the radius center of the side of the inlet diverter close to the feed inlet 132. The inlet diverter rib 135 is radially distributed with the center line of the inlet channel 134 as the center, and an inlet diverter torpedo head 133 is obliquely connected to the end of the inlet diverter rib 135 away from the inlet diverter. An outlet diverter is provided on the side of the outlet channel 113 away from the outlet port 111. An outlet diverter rib 114 is provided at the center of the radius on the side of the outlet diverter close to the outlet port 111. The outlet diverter rib 114 is radially distributed with the center line of the outlet channel 113 as the center. An outlet diverter torpedo head 112 is inclinedly connected to the end of the outlet diverter rib 114 away from the outlet diverter. An outlet static sealing ring 700 is provided between the side of the slide plate 200 away from the inlet channel 134 and the outlet plate 110. The outlet static sealing ring 700 is slidably connected to the slide plate 200.

[0045] Specifically, the inlet diverter frame, located on the side of the inlet channel 134 furthest from the feed inlet 132, is a key component for the initial dispersion of materials after they enter the screen changer. The inlet diverter frame is made of high-strength, heat-resistant alloy material, exhibiting excellent high-temperature stability and erosion resistance. Inlet diverter ribs 135, located at the radial center of the side closest to the feed inlet 132, are radially distributed around the centerline of the inlet channel 134. This radial layout allows the material entering from the feed inlet 132 to be evenly diffused in all directions. The cross-sectional shape of the inlet diverter ribs 135 is specially designed, typically streamlined, and has a smooth surface, effectively reducing material flow resistance and minimizing energy loss during the diversion process.

[0046] Specifically, the end of the inlet diversion rib 135 furthest from the inlet diversion frame is inclinedly connected to an inlet diversion torpedo head 133. The inlet diversion torpedo head 133, shaped like a torpedo, helps to further guide material flow, enabling a stable and uniform flow velocity and pressure distribution before the material enters the perforated plate 500 on the slide plate 200. The inclined connection allows the material to change its flow direction upon contact with the torpedo head, avoiding eddies and dead zones, thereby improving the uniformity and efficiency of material filtration. Simultaneously, the surface of the inlet diversion torpedo head 133 undergoes special treatment, possessing a self-cleaning function to prevent material adhesion and reduce the formation of dead material zones.

[0047] Specifically, an outlet diverter is installed on the side of the outlet channel 113 away from the discharge port 111, complementing the inlet diverter to ensure proper material flow within the screen changer. The outlet diverter is also made of high-strength, heat-resistant alloy, with outlet diverter ribs 114 located at the center of its radius near the discharge port 111, radiating outwards from the centerline of the outlet channel 113. The function of the outlet diverter ribs 114 is to re-converge and guide the material filtered by the slide plate 200, ensuring a stable discharge from the discharge port 111. The design parameters of the outlet diverter ribs 114 match those of the inlet diverter ribs 135, guaranteeing smooth material flow throughout the screen changing process.

[0048] Specifically, the outlet diverting rib 114, located away from the outlet diverting frame, is inclinedly connected to an outlet diverting torpedo head 112. The outlet diverting torpedo head 112 has a similar shape and function to the inlet diverting torpedo head 133; it performs final adjustments and acceleration of the converged material, ensuring it enters downstream equipment at a suitable flow rate and pressure. The inclination angle of the outlet diverting torpedo head 112 is precisely calculated to effectively prevent material accumulation at the outlet 111, improving the continuity and stability of material output.

[0049] Understandably, the outlet static sealing ring 700, located between the side of the slide plate 200 furthest from the inlet channel 134 and the outlet plate 110, is a crucial component ensuring the sealing performance of the screen changer. The outlet static sealing ring 700 is made of a special high-temperature resistant and wear-resistant rubber material, possessing excellent elasticity and sealing properties. The outlet static sealing ring 700 is slidably connected to the slide plate 200. During screen changing operations, the outlet static sealing ring 700 tightly conforms to the surface of the slide plate 200, preventing material leakage from the gap between the slide plate 200 and the outlet plate 110.

[0050] See Figure 3 As shown, in some embodiments of this application, a filter screen 510 is provided on the side of the perforated plate 500 near the feed inlet 132. The filter screen 510 is connected to the perforated plate 500 through a screen pressing member 520. A connecting end plate 210 is provided on the side of the slide plate 200 away from the inlet plate 130 and the outlet plate 110. A receiving groove is provided inside the connecting end plate 210.

[0051] Understandably, the filter screen 510, located on the side of the perforated plate 500 near the feed inlet 132, is the core component of the screen changer for material filtration. The filter screen 510 employs a multi-layer composite structure design, consisting of a high-precision metal wire mesh and a supporting frame. The high-precision metal wire mesh is made of corrosion-resistant, high-strength stainless steel, and its mesh size is precisely customized according to the material characteristics and filtration accuracy requirements, effectively intercepting impurity particles in the material and ensuring the purity of the filtered material.

[0052] Understandably, the filter screen 510 is connected to the perforated plate 500 via the screen clamping component 520. The design of the screen clamping component 520 ensures the stability and sealing of the filter screen 510 installation. The screen clamping component 520 uses a combination of high-strength bolts and a pressure plate. The pressure plate is made of the same material as the perforated plate 500, which is high-strength alloy steel, and its surface is finely machined to have a flat and smooth contact surface.

[0053] In some embodiments of this application, the sides of the inlet plate 130 and the outlet plate 110 are connected to the slide plate 200 with double-headed bolt supports 410, and the end of the double-headed bolt supports 410 away from the inlet plate 130 and the outlet plate 110 is connected to a fixing plate 400, and the surface of the fixing plate 400 is provided with through holes.

[0054] Specifically, a hydraulic cylinder 300 is provided on the side of the fixed plate 400 away from the inlet plate 130 and the outlet plate 110. The hydraulic cylinder 300 is provided with a piston rod, which passes through a through hole and is connected to the slide plate 200.

[0055] Specifically, a ball head 310 is provided at the end of the piston rod away from the oil cylinder 300, and the ball head 310 is located inside the receiving groove.

[0056] Understandably, the double-headed bolt support 410 and the fixing plate 400 form a stable support frame, providing a solid foundation for the installation of the hydraulic cylinder 300. This ensures that the entire structure can withstand greater thrust and tension when the piston rod drives the slide plate 200, preventing equipment swaying due to uneven force distribution and enhancing the stability of equipment operation. The hydraulic cylinder 300 connects to the slide plate 200 through the piston rod passing through the through hole in the fixing plate 400, achieving precise power transmission. Compared to traditional drive methods, the hydraulically driven cylinder 300 can provide a larger and more stable adjustable driving force, meeting the needs of the slide plate 200 for rapid and smooth screen changing under different working conditions. The matching design of the ball head 310 at the end of the piston rod and the receiving groove of the connecting end plate 210 of the slide plate 200 gives the slide plate 200 greater freedom during movement, effectively compensating for installation errors and minor displacements during equipment operation, reducing stress concentration caused by rigid connections, reducing component wear, and extending the service life of the equipment.

[0057] In some embodiments of this application, both the inlet plate 130 and the outlet plate 110 are provided with heat medium flow channels 140.

[0058] Understandably, the heat transfer medium channel 140 enables precise temperature control of the material within the screen changer. The circulating heat transfer medium effectively prevents increased viscosity and decreased flowability of materials at low temperatures, making it particularly suitable for processing high-melting-point, high-viscosity materials. This ensures the material maintains good flow during filtration, improving filtration efficiency and quality. A stable temperature environment also reduces uneven thermal expansion and contraction of equipment components due to temperature fluctuations, lowering the risk of wear and deformation between components and extending the service life of the inlet plate 130, outlet plate 110, and other related components. Furthermore, the design of the heat transfer medium channel 140 allows for flexible temperature adjustment according to different production needs, enabling the screen changer to process various materials and enhancing its versatility and production adaptability. Simultaneously, a uniform temperature distribution helps maintain the equipment's sealing performance, reducing seal failures and material leaks caused by temperature differences, ensuring the safety and stability of the production process, and reducing costs incurred by enterprises due to material waste and equipment malfunctions.

[0059] Compared with existing technologies, the beneficial effects of this utility model are that the design of the sliding plate 200 and the slide rail makes the replacement of the filter screen 510 simple and convenient. When the filter screen 510 on the perforated plate 500 needs to be replaced due to prolonged use or blockage, the operator only needs to pull the sliding plate 200 out along the slide rail to quickly disassemble and install a new perforated plate 500, which greatly shortens the screen replacement time, reduces equipment downtime, improves production efficiency, and fits the continuous and efficient production rhythm of modern industry. The pre-tightening device 600, through the imported pre-tightening spring 610, can continuously provide a stable pre-tightening force to the sliding plate 200. This pre-tightening force can ensure that the sliding plate 200 is tightly attached to the inner wall of the diversion chamber, effectively preventing melt leakage during the high temperature and high pressure material transmission process, and ensuring the sealing and reliability of the screen changer operation. The reasonable structural design of the diversion chamber and the sliding plate 200, combined with the function of the pre-tightening device 600, can optimize the flow path of materials in the screen changer, greatly reduce the area of ​​poor material flow, and effectively avoid the formation of dead material zones. This not only reduces raw material waste, but also prevents problems such as deterioration and degradation caused by long-term material retention, reduces the risk of impurities mixing into the material, ensures the stability of material quality, and further improves product quality.

[0060] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A screen changer with a reinforced sealing ring that reduces dead material zone, characterized in that, include: The housing has a flow-dividing cavity inside, and a slide is provided in the flow-dividing cavity perpendicular to the center line. The slide passes through the inner wall of the flow-dividing cavity to the outside of the housing. Several placement slots are provided inside the housing. A slide plate is mounted on a slide rail. The surface of the slide plate is provided with two sets of perforated plates. The slide plate divides the flow distribution cavity into an inlet channel and an outlet channel. A pre-tightening device is arranged parallel to the slide plate on the inner wall of the diversion cavity. A pre-tightening end is provided on the outer side of the pre-tightening device. Several inlet pre-tightening springs are provided on the surface of the pre-tightening end near the housing. The positions of the several inlet pre-tightening springs correspond to the placement grooves. The side of the pre-tightening device near the slide plate is slidably connected to the slide plate.

2. The screen switch according to claim 1, characterized in that, The housing includes an inlet plate, an outlet plate, and a gasket. The inlet plate and the outlet plate correspond to the inlet channel and the outlet channel, respectively. The gasket is disposed between the inlet plate and the outlet plate. The surface of the inlet plate has a feed port, and the surface of the outlet plate has a discharge port. The inlet plate, the outlet plate, and the gasket are bolted together.

3. The screen changer according to claim 2, characterized in that, An inlet melting and pressing activation zone is provided between the inlet plate and the pre-tightening device.

4. The screen switch according to claim 2, characterized in that, An inlet diverter is provided on the side of the inlet channel away from the feed inlet. An inlet diverter rib is provided at the center of the radius on the side of the inlet diverter closest to the feed inlet. The inlet diverter ribs are radially distributed with the center line of the inlet channel as the center. An inlet diverter torpedo head is obliquely connected to the end of the inlet diverter rib away from the inlet diverter.

5. The screen changer according to claim 2, characterized in that, An outlet diverter is provided on the side of the outlet channel away from the outlet. An outlet diverter rib is provided at the center of the radius on the side of the outlet diverter closest to the outlet. The outlet diverter ribs are radially distributed with the center line of the outlet channel as the center. An outlet diverter torpedo head is obliquely connected to the end of the outlet diverter rib away from the outlet diverter. An outlet static sealing ring is provided between the side of the slide plate away from the inlet channel and the outlet plate. The outlet static sealing ring is slidably connected to the slide plate.

6. The screen changer according to claim 1, characterized in that, A filter screen is provided on the side of the perforated plate near the feed inlet. The filter screen is connected to the perforated plate through a screen pressing component. A connecting end plate is provided on the side of the slide plate away from the inlet plate and the outlet plate. A receiving groove is provided inside the connecting end plate.

7. The screen changer according to claim 1, characterized in that, The sides of the inlet plate and outlet plate are connected to double-headed bolt supports parallel to the slide plate. The end of the double-headed bolt support away from the inlet plate and outlet plate is connected to a fixing plate, and the surface of the fixing plate has through holes.

8. The screen changer according to claim 7, characterized in that, A hydraulic cylinder is provided on the side of the fixed plate away from the inlet plate and the outlet plate. The hydraulic cylinder is equipped with a piston rod, which passes through a through hole and is connected to the sliding plate.

9. The screen changer according to claim 6 or 8, characterized in that, The piston rod is provided with a ball head at the end away from the oil cylinder, and the ball head is located inside the receiving groove.

10. The screen changer according to claim 2, characterized in that, Both the inlet plate and the outlet plate are equipped with heat medium flow channels.

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