A multi-parameter management and data monitoring glass fiber drying test equipment

Abstract

This application belongs to the field of glass fiber testing technology and discloses a multi-parameter management and data monitoring drying test equipment for glass fiber. It includes a furnace body, within which a drying chamber and a hot air chamber are arranged. Two airflow regulating devices are spaced apart within the drying chamber, forming a drying zone between them. The areas enclosed by the airflow regulating devices and the inner wall of the furnace body are the first and second air inlet zones. The hot air chamber is connected to a hot air blower via a hot air duct. A high-definition camera, temperature sensor, pressure sensor, and humidity sensor are installed within the drying zone. A dehumidification pipe is located at the bottom of the drying zone, connected to a dehumidification fan. Temperature, wind speed, and humidity sensors are installed on the dehumidification pipe. A yarn cart is located within the drying zone, equipped with a weight sensor and a high-temperature thermometer. This design enables real-time monitoring of temperature, humidity, product weight, appearance color, and product moisture content, allowing for the determination of the impact of different parameter conditions on yarn drying.

Description

Technical Field

[0001] This invention relates to the field of glass fiber testing technology, and in particular to a drying testing device for glass fiber with multi-parameter management and data monitoring. Background Technology

[0002] Glass fiber is a processable material obtained by extruding and forming a mixture of calcium silicate. Due to its excellent physical and mechanical properties, it is widely used in aerospace, civil building materials, industrial equipment, and transportation. However, glass fiber must be dried before processing. Factors such as hot air temperature, air volume, microwave power, and drying time have a significant impact on the quality of the dried glass fiber. Therefore, it is necessary to conduct multiple experiments to obtain the optimal drying conditions for glass fiber.

[0003] Currently, most domestic fiberglass manufacturers lack dedicated drying testing equipment; they typically integrate it with their production equipment, directly utilizing the drying facilities used during production for testing. Due to capacity constraints, testing often has to yield to production, making it difficult to conduct experiments. Furthermore, production equipment, limited by cost, only has detection elements for key parameters, resulting in a limited variety of relevant parameters and failing to meet the requirements for truly meaningful testing. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a drying test device for glass fibers with multi-parameter management and data monitoring.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a glass fiber drying test device with multi-parameter management and data monitoring, comprising a furnace body, wherein a drying chamber and a hot air chamber are provided in the furnace body, and external waveguides are provided on the inner walls of the furnace body on both sides of the drying chamber, and the external waveguides are connected to a microwave generator provided outside the furnace body.

[0006] The drying chamber is equipped with two air volume regulating devices arranged at intervals. The area between the two air volume regulating devices is the drying zone. The areas enclosed by the two air volume regulating devices and the inner wall of the furnace are the first air inlet zone and the second air inlet zone, respectively. The upper end of the first air inlet zone is provided with a first air inlet pipe and a first air outlet pipe that communicate with the hot air chamber. A first centrifugal fan is provided at the air inlet end of the first air inlet pipe, and a first flap valve is provided at the air outlet end of the first air outlet pipe. The upper end of the second air inlet zone is provided with a second air inlet pipe and a second air outlet pipe that communicate with the hot air chamber. A second centrifugal fan is provided at the air inlet end of the second air inlet pipe, and a second flap valve is provided at the air outlet end of the second air outlet pipe. The hot air chamber is connected to the hot air fan through a hot air pipe, and a temperature sensor is provided inside the hot air pipe.

[0007] The drying zone is also equipped with a high-definition camera, a temperature sensor, a pressure sensor, and a humidity sensor.

[0008] A dehumidification pipe is installed at the bottom of the drying zone. The dehumidification pipe extends to the outside of the furnace and is connected to a dehumidification fan. A temperature sensor, a wind speed sensor, and a humidity sensor are installed on the dehumidification pipe.

[0009] The drying area is also equipped with a yarn cart for placing yarn rolls, and the yarn cart is equipped with a weight sensor and a high-temperature thermometer.

[0010] By adopting the above technical solution, a drying chamber and a hot air chamber are set up to dry the yarn rolls on the yarn carts inside the drying chamber with hot air. Simultaneously, an external waveguide is configured to heat and remove moisture from the yarn rolls using microwave energy, thereby achieving the purpose of drying the yarn rolls. Furthermore, by installing high-definition cameras, temperature sensors, pressure sensors, and humidity sensors in the drying area, and temperature sensors, wind speed sensors, and humidity sensors on the exhaust pipes, and weight sensors and high-temperature thermometers on the yarn carts, real-time monitoring of temperature, humidity, product weight, appearance color, and product moisture content is achieved. This allows for the determination of the impact of different parameter conditions on yarn roll drying, thus better understanding the optimal conditions for yarn roll drying.

[0011] Furthermore, the first centrifugal fan and the second centrifugal fan are started at intervals, the first centrifugal fan and the second flap valve are opened and closed synchronously, and the second centrifugal fan and the first flap valve are opened and closed synchronously.

[0012] By adopting the above technical solution, two centrifugal fans are set up to form two heat distribution channels in opposite directions, so that the yarn roll can be ventilated and dried on both sides in an intermittent manner, thereby improving the uniformity of yarn roll drying.

[0013] Furthermore, an inner waveguide is provided in the drying zone, which is connected to a microwave generator. The inner waveguide divides the drying zone into two connected areas, each of which can accommodate a yarn cart.

[0014] By adopting the above technical solution, the drying area is set up as two zones, allowing for simultaneous drying tests of two yarn machines. An inner waveguide is installed between the two zones to ensure that both sides of the yarn machine can receive microwave energy.

[0015] Furthermore, each of the two areas of the drying zone is provided with an oven door, the oven door includes a door panel, one side of the door panel is rotatably mounted on the front side wall of the oven body via a rotating shaft, a gear is provided at the upper end of the rotating shaft, a drive cylinder is also provided on the oven body, a rack is connected to the end of the piston rod of the drive cylinder, the rack meshes with the gear, and a roller is provided at the bottom end of the door panel away from the rotating shaft.

[0016] By adopting the above technical solution, each of the two areas of the drying zone is equipped with a furnace door, which is used to control the opening and closing of the two areas respectively. The furnace door can be automatically opened and closed by the cooperation of the drive cylinder, rack, gear and rotating shaft, without manual operation, thus avoiding the high temperature inside the furnace that could cause injury to the operator when the door is opened manually.

[0017] Furthermore, the air volume regulating device includes a fixed perforated plate vertically fixed inside the drying chamber, a movable perforated plate attached to one side of the fixed perforated plate, a plurality of air guide holes evenly opened on the fixed perforated plate and the movable perforated plate, horizontal guide rods provided at the upper and lower ends of the fixed perforated plate, the movable perforated plate slidably mounted on the guide rods at the upper and lower ends, a fixing nut provided at the rear side of the movable perforated plate, a fixing bracket provided at the rear side of the fixed perforated plate, a lead screw rotatably mounted on the fixing bracket, the lead screw being screwed into the fixing nut, and a stepper motor connected to the rear end of the lead screw.

[0018] By adopting the above technical solution, a fixed orifice plate and a movable orifice plate are fitted together, and a number of air guide holes are evenly opened on the fixed orifice plate and the movable orifice plate. The stepper motor drives the lead screw to rotate, which drives the fixed nut to move. This causes the movable orifice plate to move along the guide rod, resulting in the air guide holes on the movable orifice plate being misaligned with the air guide holes on the fixed orifice plate. This reduces the area of ​​the through hole, thereby reducing the amount of air passing through, thus achieving the purpose of regulating the air volume.

[0019] Furthermore, the fixed perforated plate is provided with two parts, upper and lower, and the movable perforated plate is arranged with two parts accordingly.

[0020] By adopting the above technical solution, the fixed perforated plate and the movable perforated plate are set as two pieces, one above the other, which facilitates adjustment.

[0021] In summary, the present invention has the following beneficial effects: This application utilizes a drying chamber and a hot air chamber to dry the yarn rolls on the yarn cart within the drying chamber. Simultaneously, an external waveguide is configured to heat and remove moisture from the yarn rolls using microwave energy, thereby achieving the purpose of drying the yarn rolls. Furthermore, by installing a high-definition camera, temperature sensor, pressure sensor, and humidity sensor within the drying zone, and temperature sensor, wind speed sensor, and humidity sensor on the exhaust pipe, and a weight sensor and high-temperature thermometer on the yarn cart, real-time monitoring of temperature, humidity, product weight, appearance color, and product moisture content is achieved. This allows for obtaining the impact of different parameter conditions on yarn roll drying, thus better understanding the optimal conditions for yarn roll drying. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present invention;

[0024] Figure 3 , 4 These are schematic diagrams of the internal structure of the present invention from different angles in embodiments of the invention;

[0025] Figure 5 This is a schematic diagram of the air volume regulating device according to an embodiment of the present invention;

[0026] Figure 6 yes Figure 5 A magnified view of a portion of the image;

[0027] Figure 7 This is a structural schematic diagram of the furnace door portion according to an embodiment of the present invention.

[0028] In the diagram: 10. Drying chamber; 11. Drying area; 12. First air inlet area; 121. First air inlet duct; 122. First air outlet duct; 123. First centrifugal fan; 124. First flap valve; 13. Second air inlet area; 131. Second air inlet duct; 132. Second air outlet duct; 133. Second centrifugal fan; 134. Second flap valve; 20. Hot air chamber; 30. Microwave generator; 31. Outer waveguide; 32. Inner waveguide; 40. Air volume regulating device; 41. Fixed orifice plate; 42. Moving orifice plate; 43. Air guide hole; 44. Guide rod; 45. Fixing nut; 46. Fixed bracket; 47. Lead screw; 48. Stepper motor; 50. Hot air blower; 51. Hot air duct; 60. Dehumidifying fan; 61. Dehumidifying pipe; 70. Yarn carriage; 80. Furnace door; 81. Door panel; 82. Rotating shaft; 83. Gear; 84. Drive cylinder; 85. Rack; 86. Roller. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] like Figure 1-7 As shown in the illustration, this application discloses a multi-parameter management and data monitoring drying test device for glass fibers, including a furnace body. A drying chamber 10 and a hot air chamber 20 are disposed within the drying chamber 10. The drying chamber 10 is used to place yarn rolls and ventilate for drying. The hot air chamber 20 provides the drying chamber 10 with the hot air required for drying. A hot air inlet is provided at the top of the hot air chamber 20, and a hot air pipe 51 is connected to the hot air inlet. The other end of the hot air pipe 51 is connected to a hot air blower 50. A temperature sensor is also installed inside the hot air pipe 51 to detect the hot air temperature.

[0031] Two air volume regulating devices 40 are arranged at intervals inside the drying chamber 10. The area between the two air volume regulating devices 40 is the drying zone 11. The areas enclosed by the two air volume regulating devices 40 and the inner wall of the furnace are the first air inlet zone 12 and the second air inlet zone 13, respectively. The upper end of the first air inlet zone 12 is provided with a first air inlet pipe 121 and a first air outlet pipe 122 that are connected to the hot air chamber 20. A first centrifugal fan 123 is provided at the air inlet end of the first air inlet pipe 121, and a first flap valve 124 is provided at the air outlet end of the first air outlet pipe 122. The upper end of the second air inlet zone 13 is provided with a second air inlet pipe 131 and a second air outlet pipe 132 that are connected to the hot air chamber 20. A second centrifugal fan 133 is provided at the air inlet end of the second air inlet pipe 131, and a second flap valve 134 is provided at the air outlet end of the second air outlet pipe 132. In operation, the first centrifugal fan 123 and the second centrifugal fan 133 start intermittently. The first centrifugal fan 123 and the second flap valve 134 open and close synchronously, as do the second centrifugal fan 133 and the first flap valve 124. When the first centrifugal fan 123 and the second flap valve 134 are open, the first centrifugal fan 123 draws hot air from the hot air chamber 20 and discharges it through the first air inlet pipe 121, the first air inlet area 12, the drying area 11, the second air inlet area 13, and the second air outlet pipe 132 back into the hot air chamber 20 for drying from the first air inlet area 12 to the second air inlet area 13. When the second centrifugal fan 133 and the first flap valve 124 are open, the second centrifugal fan 133 draws hot air from the hot air chamber 20 and discharges it through the first air inlet pipe 121, the first air inlet area 12, the drying area 11, the second air inlet area 13, and the second air outlet pipe 132 back into the hot air chamber 20 for drying from the first air inlet area 12 to the second air inlet area 13. The air is discharged into the hot air chamber 20 through the air duct 131, the second air inlet zone 13, the drying zone 11, the first air inlet zone 12, and the first air outlet duct 122, and then dried from the second air inlet zone 13 to the first air inlet zone 12. By intermittently starting the first centrifugal fan 123 and the second centrifugal fan 133, the direction of the hot air in the drying zone 11 is continuously changed, so that the yarn roll in the drying zone 11 can be dried evenly, avoiding uneven heating on both sides of the yarn roll caused by only introducing hot air from one direction, which affects the quality of the yarn.

[0032] The airflow regulating device 40 includes a fixed perforated plate 41 vertically fixed inside the drying chamber 10, a movable perforated plate 42 attached to one side of the fixed perforated plate 41, and a plurality of air guide holes 43 evenly distributed on the fixed perforated plate 41 and the movable perforated plate 42. Horizontal guide rods 44 are provided at the upper and lower ends of the fixed perforated plate 41, and the movable perforated plate 42 is slidably mounted on the guide rods 44 at its upper and lower ends. A fixing nut 45 is provided at the rear of the movable perforated plate 42, and a fixing bracket 46 is provided at the rear of the fixed perforated plate 41. A lead screw 47 is rotatably mounted on the fixing bracket 46, and the lead screw 47 is screwed into the fixing nut 45. A stepper motor 48 is connected to the rear end of the lead screw 47. The stepper motor 48 drives the lead screw 47 to rotate, causing the fixing nut 45 to move on the lead screw 47, thereby driving the movable perforated plate 42 to move along the guide rods 44. This causes the air guide holes 43 on the movable perforated plate 42 and the fixed perforated plate 41 to be misaligned, thus reducing the through-hole area between the fixed perforated plate 41 and the movable perforated plate 42, thereby achieving the purpose of regulating the airflow. For ease of setup, the fixed perforated plate 41 is set up as two pieces, one above the other, and two movable perforated plates 42 are also arranged accordingly.

[0033] External waveguides 31 are installed on the inner walls of the furnace on both sides of the drying chamber 10, and an inner waveguide 32 is installed in the drying zone 11. The inner waveguide 32 divides the drying zone 11 into two connected areas, each of which can accommodate a yarn cart 70. Both the external waveguides 31 and the inner waveguide 32 are connected to a microwave generator 30 installed outside the furnace. The microwave energy generated by the external waveguides 31 and the inner waveguide 32 heats and removes water from the yarn rolls on the yarn carts 70 in the drying zone 11, thus assisting in the drying process. The microwave generator 30 uses a frequency converter, which allows the effect of different microwave powers on the drying of the yarn rolls to be obtained by changing the frequency of the microwave generator 30.

[0034] A dehumidification pipe 61 is installed at the bottom of the drying zone 11. The dehumidification pipe 61 extends outside the furnace body and is connected to a dehumidification fan 60. A temperature sensor, a wind speed sensor, and a humidity sensor are installed on the dehumidification pipe 61. Moisture is generated during the drying process of the yarn rolls. This moisture is discharged from the drying zone 11 through the dehumidification pipe 61 and the dehumidification fan 60, ensuring the drying effect. The temperature sensor is used to monitor the temperature in the dehumidification pipe 61 in real time; the wind speed sensor is used to monitor the wind speed in the dehumidification pipe 61 in real time; and the humidity sensor is used to monitor the humidity in the dehumidification pipe 61 in real time.

[0035] A high-definition camera, a temperature sensor, a pressure sensor, and a humidity sensor are installed in the drying zone 11. The high-definition camera is mounted on the rear side wall of the furnace body, and a hole is opened in the rear side wall. The probe of the high-definition camera extends into the hole to observe the changes in the appearance of the yarn roll during the drying process. Two temperature sensors are provided to record and report the temperature of two areas in the drying zone 11, respectively. Two pressure sensors are provided to record and report the pressure of two areas in the drying zone 11, respectively. The humidity sensor is used to detect the relative humidity in the drying zone 11.

[0036] Each of the two areas in the drying zone 11 is equipped with a yarn cart 70 for placing yarn rolls. The yarn cart 70 is equipped with a weight sensor and a high-temperature thermometer. The weight sensor and the high-temperature thermometer are connected to the furnace body via communication cables, and the furnace body transmits the signals to the control system. The weight sensor is mainly used to monitor the weight of the yarn roll in real time, and the high-temperature thermometer is mainly used to detect the internal temperature of the yarn roll.

[0037] Each of the two areas in the drying zone 11 has a furnace door 80. Each furnace door 80 includes a door panel 81. One side of the door panel 81 is rotatably mounted on the front wall of the furnace body via a rotating shaft 82. A gear 83 is mounted on the upper end of the rotating shaft 82. A drive cylinder 84 is also mounted on the furnace body. A rack 85 is connected to the piston rod end of the drive cylinder 84, and the rack 85 meshes with the gear 83. A roller 86 is mounted on the bottom end of the door panel 81, away from the rotating shaft 82. The drive cylinder 84 drives the rack 85, which in turn drives the gear 83 to rotate, thereby driving the rotating shaft 82 and the door panel 81 to rotate. The roller 86 supports the door panel 81 and assists in its rotation, reducing torque and making it easier to open and close the furnace door 80. The automatic control of the furnace door 80's opening and closing by the drive cylinder 84 eliminates the need for manual opening, effectively preventing injury to operators from the high-temperature gas inside the furnace when the door is manually opened.

[0038] The operating principle of the glass fiber drying test equipment with multi-parameter management and data monitoring in this embodiment is as follows: The yarn roll to be tested is placed on the yarn cart 70, the yarn cart 70 is placed into the drying zone 11, and the furnace door 80 of the drying zone 11 is closed for drying testing. During the test, the hot air temperature can be changed by adjusting the power of the hot air blower 50; the air volume can be adjusted by adjusting the overlap of the guide holes 43 of the moving perforated plate 42 and the fixed perforated plate 41 within the air volume regulating device 40; the air inlet direction can be changed by controlling the interval start-up of the first centrifugal fan 123 and the second centrifugal fan 133; the extraction of moisture can be accelerated by adjusting the frequency of the variable microwave generator 30; and excess moisture in the drying zone 11 can be discharged by the dehumidifying fan 60. Specifically, real-time data on glass fiber production is acquired and real-time adjustments are made through the sensing devices installed in the drying zone 11, the dehumidifying pipe 61, and the yarn cart 70.

[0039] The weight sensor on the yarn carriage 70 is used to obtain the moisture loss of the yarn roll in real time during production, calculate the moisture content of the wet yarn, and plot the moisture content decrease curve.

[0040] The temperature in the drying zone 11 is monitored in real time by a temperature sensor, and the set temperature is automatically adjusted and the curve is plotted.

[0041] The pressure in the drying zone 11 is monitored in real time by a pressure sensor and a curve is plotted.

[0042] The relative humidity within the drying zone 11 of the main space is monitored by a humidity sensor.

[0043] The temperature in the exhaust pipe 61 is monitored in real time by a temperature sensor on the exhaust pipe 61.

[0044] The wind speed in the exhaust pipe 61 is monitored in real time by a wind speed sensor on the exhaust pipe 61.

[0045] The humidity in the exhaust pipe 61 is monitored in real time by a humidity sensor on the exhaust pipe 61.

[0046] Based on the aforementioned test data, this application can achieve the following functions:

[0047] Simulate the effects of different temperatures or temperature gradients on drying; simulate the effects of different microwave power arrangements or simple microwave drying; simulate the effects of different air volumes or wind speeds on drying.

[0048] Simulate the impact of different dehumidification air volumes on drying; realize online data analysis of intelligent upper-level system, and monitor yarn roll curve, weight, and water loss online.

[0049] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A multi-parameter management and data monitoring drying test device for glass fibers, comprising a furnace body, characterized in that: The furnace body is provided with a drying chamber (10) and a hot air chamber (20) provided on the drying chamber (10). External waveguides (31) are provided on the inner walls of the furnace body on both sides of the drying chamber (10). The external waveguides (31) are connected to a microwave generator (30) provided outside the furnace body. The drying chamber (10) is equipped with two air volume regulating devices (40) arranged at intervals. The area between the two air volume regulating devices (40) is the drying zone (11). The areas enclosed by the two air volume regulating devices (40) and the inner wall of the furnace are the first air inlet zone (12) and the second air inlet zone (13), respectively. The upper end of the first air inlet zone (12) is provided with a first air inlet pipe (121) and a first air outlet pipe (122) that communicate with the hot air chamber (20). The air inlet end of the first air inlet pipe (121) is provided with a first centrifugal fan (123). The first air outlet pipe (122) is equipped with a first flap valve (124) at the air outlet end. The second air inlet area (13) is equipped with a second air inlet pipe (131) and a second air outlet pipe (132) that are connected to the hot air chamber (20) at the upper end. The second air inlet pipe (131) is equipped with a second centrifugal fan (133) at the air inlet end. The second air outlet pipe (132) is equipped with a second flap valve (134) at the air outlet end. The hot air chamber (20) is connected to the hot air fan (50) through a hot air pipe (51). A temperature sensor is installed inside the hot air pipe (51). The first centrifugal fan (123) and the second centrifugal fan (133) are started at intervals. The first centrifugal fan (123) and the second flap valve (134) are opened and closed synchronously. The second centrifugal fan (133) and the first flap valve (124) are opened and closed synchronously. The drying zone (11) is also equipped with a high-definition camera, a temperature sensor, a pressure sensor and a humidity sensor; The bottom of the drying zone (11) is provided with a dehumidification pipe (61), which extends to the outside of the furnace and is connected to a dehumidification fan (60). A temperature sensor, a wind speed sensor and a humidity sensor are provided on the dehumidification pipe (61). The drying zone (11) is also equipped with a yarn cart (70) for placing yarn rolls, and the yarn cart (70) is equipped with a weight sensor and a high temperature measuring instrument.

2. The glass fiber drying test equipment with multi-parameter management and data monitoring according to claim 1, characterized in that: An inner waveguide (32) is provided in the drying zone (11). The inner waveguide (32) is connected to the microwave generator (30). The inner waveguide (32) divides the drying zone (11) into two connected areas, each of which can accommodate a yarn cart (70).

3. The glass fiber drying test equipment with multi-parameter management and data monitoring according to claim 2, characterized in that: Each of the two areas of the drying zone (11) is provided with a furnace door (80). The furnace door (80) includes a door panel (81). One side of the door panel (81) is rotatably mounted on the front side wall of the furnace body via a rotating shaft (82). A gear (83) is provided at the upper end of the rotating shaft (82). A drive cylinder (84) is also provided on the furnace body. A rack (85) is connected to the piston rod end of the drive cylinder (84). The rack (85) meshes with the gear (83). A roller (86) is provided at the bottom end of the door panel (81) away from the rotating shaft (82).

4. The glass fiber drying test equipment with multi-parameter management and data monitoring according to claim 1, characterized in that: The air volume regulating device (40) includes a fixed perforated plate (41) vertically fixed in the drying chamber (10), a movable perforated plate (42) attached to one side of the fixed perforated plate (41), a plurality of air guide holes (43) evenly opened on the fixed perforated plate (41) and the movable perforated plate (42), a horizontal guide rod (44) provided at the upper and lower ends of the fixed perforated plate (41), the movable perforated plate (42) slidably mounted on the guide rod (44) at the upper and lower ends, a fixing nut (45) provided at the rear side of the movable perforated plate (42), a fixing bracket (46) provided at the rear side of the fixed perforated plate (41), a lead screw (47) rotatably mounted on the fixing bracket (46), the lead screw (47) and the fixing nut (45) are screwed together, and a stepper motor (48) is connected to the rear end of the lead screw (47).

5. The glass fiber drying test equipment with multi-parameter management and data monitoring according to claim 4, characterized in that: The fixed perforated plate (41) is provided with two upper and lower parts, and the movable perforated plate (42) is arranged with two parts corresponding to each other.

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