Plate type bimetallic tension seal structure screen changer

Abstract

The utility model provides a kind of plate type bimetallic tensioning sealing structure screen changer, it relates to sealing structure technical field, including: shell, inside being provided with bunker, the shell is vertically provided with slide in the bunker center line, the slide penetrates shell both sides;Sliding plate, it is set on the slide of the shell, the upper surface of the sliding plate is provided with multiple perforated plate;Metal sealing device, it is set inside bunker, the metal sealing device is slidably connected with sliding plate;Pre-tensioning device, it is set inside the metal sealing device, for the tensioning of metal sealing device.The utility model metal sealing device in bunker is slidably connected with sliding plate, effectively ensure the sealing property of bunker, and pre-tensioning device being set inside metal sealing device, further tensioning is carried out to metal sealing device, enhances its sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of sealing structure technology, and more specifically, to a plate-type bimetallic expansion sealing structure screen changer. Background Technology

[0002] In many industrial sectors such as plastics and rubber processing, impurities often become mixed into materials during production, which can seriously affect product quality and performance. Screen changers, as a key piece of equipment, primarily function to continuously filter impurities from materials during production, ensuring material purity, thereby improving product quality and reducing product defects caused by impurities, such as bubbles, spots, and reduced strength. Simultaneously, screen changers can also improve production efficiency and reduce equipment failures and downtime caused by impurity accumulation.

[0003] Traditional screen changers often have simple sealing structures, making them prone to leakage under high-temperature and high-pressure operating environments. This not only wastes materials but can also pollute the production environment and even affect the normal operation of production equipment. For example, during plastic extrusion, if molten plastic leaks from the screen changer seal, it will adhere to the equipment surface, requiring shutdown for cleaning and severely impacting production efficiency.

[0004] Therefore, there is an urgent need for a plate-type bimetallic tensioning seal structure screen changer to replace the existing sealing method in order to solve the problem of how to reduce material retention in the pre-tightening part of the sealing ring. Utility Model Content

[0005] In view of this, this utility model proposes a plate-type bimetallic tension sealing structure screen changer, which aims to solve the problem of how to reduce material retention in the pre-tightening part of the sealing ring.

[0006] This utility model provides a plate-type bimetallic tension sealing structure screen changer, including:

[0007] The shell has a material hopper inside, and the shell has a slide rail in the direction perpendicular to the axis of the material hopper, the slide rail passing through both sides of the shell;

[0008] A sliding plate is mounted on a slide rail of the housing, and the upper surface of the sliding plate is provided with two sets of perforated plates;

[0009] A metal sealing device is installed inside the hopper, and the metal sealing device is slidably connected to the slide plate;

[0010] A pre-tensioning device is disposed inside the metal sealing device, and the pre-tensioning device is used to tighten the metal sealing device.

[0011] Furthermore, double-headed bolt supports are distributed on the side of the housing through which the slide rail penetrates. A cylinder fixing plate is provided at the end of the double-headed bolt support away from the housing. The double-headed bolt support is bolted to the cylinder fixing plate. The cylinder fixing plate is provided with cooling pipes. A through hole is opened in the middle of the upper surface of the cylinder fixing plate. A cylinder is provided on the lower surface of the cylinder fixing plate. The cylinder is provided with a cylinder piston rod. The cylinder piston rod passes through the through hole and is connected to the slide plate.

[0012] Furthermore, a limiting plate is provided on the side of the slide away from the oil cylinder, and the width of the limiting plate is greater than the width of the slide rail. A connecting end plate is provided on the side of the slide near the oil cylinder, and a first placement groove is provided between the slide and the connecting end plate. A cylinder piston rod ball head is provided on the end of the oil cylinder piston rod away from the oil cylinder, and the cylinder piston rod ball head is placed inside the first placement groove. The slide and the connecting end plate are detachably connected.

[0013] Furthermore, the housing includes an inlet plate, an outlet plate, and a gasket. The gasket is disposed between the inlet plate and the outlet plate and is connected to the interior of both sides of the inlet plate and the outlet plate. The direction of the gasket is the same as the through direction of the slide rail.

[0014] It is slidably connected to the slide plate, and the inlet plate, outlet plate and pad are fastened together by bolts.

[0015] Furthermore, the upper surface of the inlet plate is provided with a feed inlet, which is connected to the hopper. A pressure sensor is provided on the side of the inlet plate. The upper surface of the outlet plate is provided with a discharge outlet, which is connected to the hopper. A temperature sensor is provided on the same side of the outlet plate as the inlet plate. Heating pipes are provided on the sides of both the feed inlet and the discharge outlet, and the heating pipes pass through the interior of the inlet plate and the outlet plate, respectively.

[0016] Furthermore, the two sets of perforated plates have the same structure, the upper surface of both sets of perforated plates faces the feed inlet, and the upper surface is provided with a filter screen, which is detachably connected to the perforated plate.

[0017] Furthermore, the metal sealing device includes an inlet sealing ring, an outlet sealing ring, and a metal sealing ring;

[0018] The metal sealing ring is fitted onto the inlet end of the hopper and fits against the inner wall of the inlet end. An inlet sealing ring is provided between the upper surface of the slide plate and the side of the metal sealing ring away from the outlet end. The outlet sealing ring is fitted onto the outlet end of the hopper and fits against the inner wall of the outlet end. The side of the outlet sealing ring away from the outlet end fits against the lower surface of the slide plate. The inner diameters of the inlet sealing ring, outlet sealing ring, and metal sealing ring are the same and are all equal to the inner diameter of the perforated plate.

[0019] Furthermore, the pre-tensioning device is provided on the side of the inlet sealing ring near the metal sealing ring. The pre-tensioning device includes a plurality of second placement grooves, which are evenly distributed, and an inlet pre-tensioning spring is placed inside the second placement groove.

[0020] Furthermore, the metal sealing ring is a copper ring.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. Because the slide plate is set on the slide rail of the housing, and the upper surface of the slide plate is equipped with two sets of perforated plates, when the filter screen needs to be replaced, the filter screen can be replaced quickly and conveniently by sliding the slide plate, which improves production efficiency and reduces downtime and production costs caused by screen replacement.

[0023] 2. The metal sealing device is located inside the hopper and slides smoothly with the slide plate. Simultaneously, a pre-tensioning device tightens the metal sealing device. This structural design effectively ensures the airtightness of the hopper's interior, preventing material leakage from the connection between the slide plate and the hopper during flow. This ensures normal material flow and processing stability, improving product quality and production safety.

[0024] 3. The bimetallic sealing device and pre-tensioning device better adapt to different working environments and pressure conditions, reducing wear and damage to the sealing device. This extends the overall service life of the screen changer to a certain extent and reduces equipment maintenance and replacement costs. Attached Figure Description

[0025] 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:

[0026] Figure 1 A schematic diagram of the plate-type bimetallic tension sealing structure screen changer provided in this embodiment of the utility model;

[0027] Figure 2 for Figure 1 Cross-sectional view of the screen changer with plate-type bimetallic expansion seal structure in the BB direction;

[0028] Figure 3 for Figure 1 Cross-sectional view of the AA-direction plate-type bimetallic tensioning seal structure screen changer;

[0029] Figure 4 for Figure 3A magnified view of a portion of point A in the middle.

[0030] In the diagram: 100-Shell; 110-Inlet plate; 111-Pressure sensor; 120-Outlet plate; 121-Temperature sensor; 130-Feed inlet; 140-Outlet; 150-Heating pipe; 160-Gap strip; 170-Inlet end; 180-Outlet end; 200-Slide plate; 210-Perforated plate; 220-Limiting plate; 230-Connecting end plate; 240-Filter screen; 300-Metal sealing device; 310-Inlet sealing ring; 320-Outlet sealing ring; 330-Metal sealing ring; 400-Pretensioning device; 410-Inlet pretensioning spring; 500-Cylinder fixing plate; 510-Double-headed bolt support; 520-Cooling pipe; 600-Cylinder; 610-Cylinder piston rod; 620-Cylinder piston rod ball head. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] See Figure 1 and Figure 2As shown, this embodiment provides a plate-type bimetallic tensioning seal structure screen changer, including:

[0036] The shell 100 has a material hopper inside, and a slide rail is provided in the direction perpendicular to the axis of the material hopper, which runs through both sides of the shell 100.

[0037] The slide plate 200 is set on the slide rail of the housing 100, and the upper surface of the slide plate 200 is provided with two sets of perforated plates 210.

[0038] A metal sealing device 300 is installed inside the hopper and is slidably connected to the slide plate 200;

[0039] The pre-tensioning device 400 is installed inside the metal sealing device 300 and is used to tighten the metal sealing device 300.

[0040] Specifically, double-headed bolt supports 510 are distributed on the side of the housing 100 through which the slide rail penetrates. A cylinder fixing plate 500 is provided at the end of the double-headed bolt supports 510 away from the housing 100. The double-headed bolt supports 510 and the cylinder fixing plate 500 are bolted together. The cylinder fixing plate 500 is provided with a cooling pipe 520. A through hole is opened in the middle of the upper surface of the cylinder fixing plate 500. A cylinder 600 is provided on the lower surface of the cylinder fixing plate 500. The cylinder 600 is provided with a cylinder piston rod 610. The cylinder piston rod 610 passes through the through hole and is connected to the slide plate 200.

[0041] Understandably, the cooling pipes 520 mounted on the cylinder mounting plate 500 possess excellent heat dissipation capabilities. During continuous operation of the cylinder 600, a significant amount of heat is generated due to energy conversion. If this heat is not dissipated in time, it can lead to accelerated wear of the cylinder 600 components, decreased sealing performance, and even frequent malfunctions. The cooling pipes 520, through the circulation of coolant, can quickly remove the heat generated by the cylinder 600, maintaining it within a suitable operating temperature range, significantly extending its service life, and improving the stability and durability of the equipment operation. The through-hole in the center of the upper surface of the cylinder mounting plate 500 cooperates with the cylinder piston rod 610 to achieve precise and efficient power transmission. When the hydraulic cylinder 600 is working, its piston rod 610 can pass through the through hole and connect with the slide plate 200 without obstruction, ensuring that the thrust or pull generated by the hydraulic cylinder 600 can be directly and accurately transmitted to the slide plate 200, so that the slide plate 200 can slide smoothly and accurately on the slide rail, thereby precisely controlling the position and movement of the perforated plate 210 on the slide plate 200 in the hopper, and meeting the strict requirements for the position and movement accuracy of the slide plate 200 in the material handling process.

[0042] Specifically, a limiting plate 220 is provided on the side of the slide plate 200 away from the hydraulic cylinder 600. The width of the limiting plate 220 is greater than the width of the slide track. A connecting end plate 230 is provided on the side of the slide plate 200 close to the hydraulic cylinder 600. A first placement groove is provided between the slide plate 200 and the connecting end plate 230. A hydraulic cylinder piston rod ball head 620 is provided on the end of the hydraulic cylinder piston rod 610 away from the hydraulic cylinder 600. The hydraulic cylinder piston rod ball head 620 is placed inside the first placement groove. The slide plate 200 and the connecting end plate 230 are detachably connected.

[0043] Understandably, the limiting plate 220 located on the side of the slide plate 200 away from the hydraulic cylinder 600, and its width being greater than the width of the slide track, provides reliable limiting protection for the movement of the slide plate 200. When the slide plate 200 slides on the slide track, the limiting plate 220 can effectively prevent the slide plate 200 from leaving the slide track due to excessive movement. The side of the slide plate 200 closest to the hydraulic cylinder 600 is connected to the hydraulic cylinder piston rod 610 through the connecting end plate 230, and the ball head 620 of the hydraulic cylinder piston rod is placed in the first placement groove between the slide plate 200 and the connecting end plate 230. This design achieves a flexible connection method. The engagement between the cylinder piston rod ball head 620 and the placement groove allows the cylinder piston rod 610 to be adjusted within a certain range. When the slide plate 200 moves on the slide rail, even if there is a slight deviation in the direction of movement of the slide plate 200 due to various factors, the cylinder piston rod ball head 620 connection can adaptively adjust to ensure smooth power transmission between the cylinder piston rod 610 and the slide plate 200, reduce stress concentration and component wear caused by rigid connection, and extend the service life of the equipment.

[0044] See Figure 3 As shown, the housing 100 includes an inlet plate 110, an outlet plate 120, and a pad 160. The pad 160 is disposed between the inlet plate 110 and the outlet plate 120 and is connected to the interior of both sides of the inlet plate 110 and the outlet plate 120. The pad 160 is disposed in the same direction as the slide rail through direction and is slidably connected to the slide plate 200. The inlet plate 110, the outlet plate 120, and the pad 160 are fastened together by bolts.

[0045] Specifically, the upper surface of the inlet plate 110 is provided with a feed inlet 130, which is connected to the hopper. A pressure sensor 111 is provided on the side of the inlet plate 110. The upper surface of the outlet plate 120 is provided with a discharge outlet 140, which is connected to the hopper. A temperature sensor 121 is provided on the same side of the outlet plate 120 and the inlet plate 110. Heating pipes 150 are provided on the sides of both the feed inlet 130 and the discharge outlet 140, and the heating pipes 150 pass through the interior of the inlet plate 110 and the outlet plate 120, respectively.

[0046] Understandably, the pressure sensor 111 on the side of the inlet plate 110 can monitor the pressure of the material entering the hopper in real time, while the temperature sensor 121 on the same side of the outlet plate 120 can measure the temperature of the material when it is discharged. Through these two devices, operators can promptly understand the pressure and temperature changes of the material inside the hopper, accurately adjust equipment operating parameters, ensure the stability and safety of the material handling process, and avoid equipment failure or impact on material quality due to excessive pressure or abnormal temperature.

[0047] Specifically, the two sets of perforated plates 210 have the same structure. The upper surface of both sets of perforated plates 210 faces the feed inlet 130, and the upper surface is provided with a filter screen 240. The filter screen 240 is detachably connected to the perforated plate 210.

[0048] See Figure 3 and Figure 4 As shown, the metal sealing device 300 includes an inlet sealing ring 310, an outlet sealing ring 320, and a metal sealing ring 330;

[0049] A metal sealing ring 330 is fitted onto the inlet end 170 of the hopper, and the metal sealing ring 330 is in contact with the inner wall of the inlet end 170 of the hopper. An inlet sealing ring 310 is provided between the upper surface of the slide plate 200 and the side of the metal sealing ring 330 away from the outlet end 180. An outlet sealing ring 320 is fitted onto the outlet end 180 of the hopper, and the outlet sealing ring 320 is in contact with the inner wall of the outlet end 180 of the hopper. The side of the outlet sealing ring 320 away from the outlet end 180 is in contact with the lower surface of the slide plate 200. The inner diameters of the inlet sealing ring 310, the outlet sealing ring 320 and the metal sealing ring 330 are the same, and are all equal to the inner diameter of the perforated plate 210.

[0050] Specifically, the imported sealing ring 310 has a pre-tensioning device 400 on the side close to the metal sealing ring 330. The pre-tensioning device 400 includes several second placement grooves, which are evenly distributed. An imported pre-tensioning spring 410 is placed inside the second placement groove. The metal sealing ring 330 is a copper ring.

[0051] Understandably, the metal sealing ring 330 uses a copper ring, taking advantage of copper's higher coefficient of thermal expansion compared to the sealing ring and housing 100, which provides a unique advantage during equipment heating. As the temperature rises, the copper ring expands, automatically filling the gaps between itself and the bottom surface of housing 100, the contact surface of the sealing ring, and the inner circle of housing 100. This characteristic ensures the equipment maintains a good seal under varying temperature conditions, eliminating the need for additional complex temperature compensation structures, effectively improving the equipment's adaptability to temperature changes, and reducing the risk of seal failure due to thermal expansion and contraction.

[0052] Example

[0053] Equipment preparation and preheating: Before formal operation, start the heating system of the screen changer, allowing the heating pipe 150 to heat the inlet plate 110 and outlet plate 120 until the required process temperature is reached. Simultaneously, all components are in their initial positions: the slide plate 200 is located at the initial end of the slide rail, the metal sealing device 300 is positioned in the hopper, and the inlet pre-tensioning spring 410 in the pre-tensioning device 400 has already tensioned the inlet sealing ring 310 to ensure a tight seal and prevent debris from entering between the slide plate 200 and the sealing ring.

[0054] Material feeding: Once the temperature reaches the target level, the material enters the silo through the feed inlet 130 on the upper surface of the inlet plate 110. During the feeding process, the pressure sensor 111 on the side of the inlet plate 110 monitors the pressure of the material entering in real time and feeds the data back to the operator or control system so as to adjust the feeding process and ensure stable feeding pressure.

[0055] Slide 200 Drive and Material Handling: The operator starts the hydraulic cylinder 600, which drives the piston rod 610 to extend. Since the piston rod 610 passes through the through hole in the middle of the upper surface of the hydraulic cylinder fixing plate 500 and connects to the first placement groove on the slide 200 through the piston rod ball head 620, the thrust generated by the piston rod 610 can be precisely transmitted to the slide 200, allowing the slide 200 to slide smoothly on the track. Two sets of perforated plates 210 on the upper surface of the slide 200 move together with the slide 200 into the hopper. The filter screens 240 on the perforated plates 210 begin filtering the material. During the movement of the slide 200, if there is a slight deviation in the direction of movement due to various factors, the engagement between the piston rod ball head 620 and the first placement groove can adaptively adjust to ensure smooth power transmission. Simultaneously, the limiting plate 220 on the side of the slide 200 away from the hydraulic cylinder 600 prevents the slide 200 from moving excessively and detaching from the track.

[0056] Sealing and Material Flow: During the movement of the perforated plate 210 driven by the slide plate 200, the metal sealing device 300 plays a crucial role. The metal sealing ring 330 is fitted onto the inlet end 170 of the hopper and fits against the inner wall of the inlet end 170. The inlet sealing ring 310 is set between the upper surface of the slide plate 200 and the side of the metal sealing ring 330 away from the outlet end 180. The outlet sealing ring 320 is fitted onto the outlet end 180 of the hopper and fits against the inner wall of the outlet end 180. Its side away from the outlet end 180 fits against the lower surface of the slide plate 200. Together, they ensure the normal flow of materials in the hopper without leakage. As heating continues, the metal sealing ring 330 (copper ring) will expand due to its larger coefficient of thermal expansion than that of the sealing ring and the housing 100. This expansion will automatically eliminate the gaps between the copper ring and the bottom surface of the housing 100, the contact surface between the copper ring and the sealing ring, and the inner circle of the copper ring and the housing 100. This effectively prevents materials from entering the pre-tightening structure and the contact surface between the sealing ring and the housing 100. As a result, the mating surface between the inlet sealing ring 310 and the inner circle of the housing 100 does not require precise fitting.

[0057] Compared with the prior art, the beneficial effects of this utility model are as follows: Since the slide plate 200 is set on the slide rail of the housing 100, and the upper surface of the slide plate 200 is provided with two sets of perforated plates 210, when the filter screen 240 needs to be replaced, the filter screen 240 can be replaced quickly and conveniently by sliding the slide plate 200, improving production efficiency and reducing downtime and production costs caused by screen replacement. The metal sealing device 300 is set inside the hopper and slidably connected to the slide plate 200. Simultaneously, the pre-tensioning device 400 tensions the metal sealing device 300. This structural design effectively ensures the sealing of the hopper, preventing material leakage from the connection between the slide plate 200 and the hopper during flow, ensuring normal material flow and processing stability, and improving product quality and production safety. The bimetallic sealing device and the pre-tensioning device 400 can better adapt to different working environments and pressure conditions, reducing wear and damage to the sealing device. This extends the overall service life of the screen changer to a certain extent and reduces equipment maintenance and replacement costs.

[0058] 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 plate-type bimetallic tension sealing structure screen changer, characterized in that, include: The shell has a material hopper inside, and the shell has a slide rail in the direction perpendicular to the axis of the material hopper, the slide rail passing through both sides of the shell; A sliding plate is mounted on a slide rail of the housing, and the upper surface of the sliding plate is provided with two sets of perforated plates; A metal sealing device is installed inside the hopper, and the metal sealing device is slidably connected to the slide plate; A pre-tensioning device is disposed inside the metal sealing device, and the pre-tensioning device is used to tighten the metal sealing device.

2. The plate-type bimetallic tensioning seal structure screen changer according to claim 1, characterized in that, Double-headed bolt supports are distributed on the side of the housing through which the slide rail penetrates. A cylinder fixing plate is provided at the end of the double-headed bolt support away from the housing. The double-headed bolt support is bolted to the cylinder fixing plate. The cylinder fixing plate is provided with cooling pipes. A through hole is opened in the middle of the upper surface of the cylinder fixing plate. A cylinder is provided on the lower surface of the cylinder fixing plate. The cylinder is provided with a cylinder piston rod. The cylinder piston rod passes through the through hole and is connected to the slide plate.

3. The plate-type bimetallic tension sealing structure screen changer according to claim 2, characterized in that, A limiting plate is provided on the side of the slide away from the oil cylinder, and the width of the limiting plate is greater than the width of the slide rail. A connecting end plate is provided on the side of the slide close to the oil cylinder. A first placement groove is provided between the slide and the connecting end plate. A cylinder piston rod ball head is provided on the end of the oil cylinder piston rod away from the oil cylinder. The cylinder piston rod ball head is placed inside the first placement groove. The slide and the connecting end plate are detachably connected.

4. The plate-type bimetallic tension sealing structure screen changer according to claim 1, characterized in that, The housing includes an inlet plate, an outlet plate, and a pad. The pad is disposed between the inlet plate and the outlet plate and is connected to the interior of both sides of the inlet plate and the outlet plate. The pad is disposed in the same direction as the slide rail through direction and is slidably connected to the slide plate. The inlet plate, the outlet plate, and the pad are fastened together by bolts.

5. The plate-type bimetallic tensioning seal structure screen changer according to claim 4, characterized in that, The upper surface of the inlet plate is provided with a feed inlet, which is connected to the hopper. A pressure sensor is provided on the side of the inlet plate. The upper surface of the outlet plate is provided with a discharge outlet, which is connected to the hopper. A temperature sensor is provided on the same side of the outlet plate as the inlet plate. Heating pipes are provided on the sides of both the feed inlet and the discharge outlet, and the heating pipes pass through the interior of the inlet plate and the outlet plate respectively.

6. The plate-type bimetallic tensioning seal structure screen changer according to claim 5, characterized in that, Both sets of perforated plates have the same structure. The upper surface of both sets of perforated plates faces the feed inlet, and a filter screen is provided on the upper surface. The filter screen is detachably connected to the perforated plate.

7. The plate-type bimetallic tensioning seal structure screen changer according to claim 1, characterized in that, The metal sealing device includes an inlet sealing ring, an outlet sealing ring, and a metal sealing ring; The metal sealing ring is fitted onto the inlet end of the hopper and fits against the inner wall of the inlet end. An inlet sealing ring is provided between the upper surface of the slide plate and the side of the metal sealing ring away from the outlet end. The outlet sealing ring is fitted onto the outlet end of the hopper and fits against the inner wall of the outlet end. The side of the outlet sealing ring away from the outlet end fits against the lower surface of the slide plate. The inner diameters of the inlet sealing ring, outlet sealing ring, and metal sealing ring are the same and are all equal to the inner diameter of the perforated plate.

8. The plate-type bimetallic tension sealing structure screen changer according to claim 7, characterized in that, The pre-tensioning device is provided on the side of the imported sealing ring near the metal sealing ring. The pre-tensioning device includes a plurality of second placement grooves, which are evenly distributed, and an imported pre-tensioning spring is placed inside the second placement groove.

9. The plate-type bimetallic tension sealing structure screen changer according to claim 7, characterized in that, The metal sealing ring is a copper ring.

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