A hierarchical sedimentation and filtration integrated laboratory wastewater multi-stage purification device

Abstract

The application relates to a layered sedimentation and filtration integrated laboratory wastewater multistage purification device, and relates to the technical field of wastewater treatment. The device comprises a tank body, a detachable filter plate arranged at the middle of the tank body, a sewage outlet arranged at the lower end of the tank body, a water outlet arranged on the side wall of the tank body, a face tooth ring arranged at the upper end of the tank body, a horizontal frame connected with the inner wall of the tank body, an overhead plate arranged at the upper end of the horizontal frame, a driving motor arranged at the upper end of the overhead plate, a driving motor output end penetrating through the overhead plate and extending to the lower end of the filter plate, a blockage prevention assembly arranged between the face tooth ring and the overhead plate and used for cleaning the filter plate, a scraper plate rotating in a circumferential direction along the upper end surface of the filter plate, and a composite motion of superimposed arc reciprocating oscillation, which can scrape off the solid-phase impurities intercepted on the surface of the filter hole at multiple angles, avoids the reduction of the flow area of the filter hole caused by the accumulation of the impurities, maintains the stable filtration flux, and guarantees the continuous and stable operation of the filtration link.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multi-stage purification device for laboratory wastewater that integrates stratified sedimentation and filtration. Background Technology

[0002] Laboratory wastewater has a complex composition, generally containing suspended particles, colloidal substances, and various pollutants. Existing treatment processes typically employ a multi-stage purification route that combines filtration pretreatment with flocculation and sedimentation. Large solid particles are trapped by the filtration unit, and then flocculants are added and stirred to cause fine suspended solids and colloids to coagulate and form flocs, which then settle and separate. This process is a common method for treating this type of wastewater.

[0003] During the operation of existing equipment, solid impurities continuously accumulate on the surface of the filter plates. As the treatment time increases, the effective flow area of ​​the filter pores gradually decreases, and the filtration flux decreases accordingly, thus affecting the influent treatment rate. At the same time, the stirring structure of the flocculation unit mostly adopts a fixed motion amplitude. When the treatment liquid level in the device changes dynamically with the influent process, the stirring shear strength is too high under low liquid level conditions, which can easily cause floc breakage. Under high liquid level conditions, the mixing strength is insufficient, which affects the sedimentation separation effect and the overall treatment efficiency.

[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage purification device for laboratory wastewater that integrates stratified sedimentation and filtration, in order to solve the problems mentioned in the background. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration, comprising a tank, a detachable filter plate in the middle of the tank, a drain outlet at the lower end of the tank, a drain outlet on the side wall of the tank, a toothed ring at the upper end of the tank, the toothed ring being connected to the inner wall of the tank via a crossbar, an overhead plate installed at the upper end of the crossbar, a drive motor installed at the upper end of the overhead plate, the output end of the drive motor penetrating the overhead plate and extending to the lower end of the filter plate; An anti-clogging component is provided between the toothed ring and the overhead plate for cleaning the filter plate; The lower end of the motor output terminal is equipped with a flocculation component for flocculating the filtered wastewater.

[0007] Preferably, the anti-clogging component includes a drive disc disposed between the toothed ring and the overhead plate, the drive disc being connected to the motor output end, and an annular groove being formed at the lower end of the drive disc.

[0008] Preferably, symmetrically arranged sliders are slidably connected within the annular groove, and each slider has a frame plate connected to its lower end, the frame plate being rectangular in shape.

[0009] Preferably, the lower end of the drive disc is connected to symmetrically arranged vertical brackets, and each of the two vertical brackets is rotatably connected to a round shaft on the side that is far apart from each other, and a gear is installed at the end of each round shaft.

[0010] Preferably, the gear meshes with the face gear ring, and each end face of the gear away from the center is connected to a drive shaft, which is movably inserted into the hollow part of the frame plate.

[0011] Preferably, each of the frame plates is connected to a drive rod at its lower end, and each drive rod is connected to a scraper at its lower end. The scraper is in contact with and fits against the upper surface of the filter plate, and each upper surface of the scraper is provided with a long groove.

[0012] Preferably, the flocculation component includes a drive block installed at the motor output end, with a protective cover integrally formed on the upper end of the drive block, and two stirring rods rotatably connected to the drive block, each stirring rod having stirring blades connected to its sidewall.

[0013] Preferably, a transverse moving rod is laterally connected to the upper end of the stirring rod, and a force-bearing rod is connected to the end of each transverse moving rod, with the lower end of the force-bearing rod embedded in a long groove.

[0014] Preferably, a sleeve is rotatably connected to the upper end of the drive block, a top plate is connected to the outer wall of the sleeve, the top plate abuts against the end of the transverse rod, the transverse rod moves through the protective cover, a curved groove is opened on the outer wall of the sleeve, and two lifting rods are slidably connected to the drive block corresponding to the curved groove.

[0015] Preferably, both lifting rods are connected to an extrusion block at their upper ends, the extrusion block being movably embedded in a curved groove, and both lifting rods are connected to an annular float at their lower ends.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a drive motor to drive a drive disc to rotate circumferentially. The vertical bracket revolves with the drive disc and drives the gear to move circumferentially along a fixed toothed ring. The gear rotates under the meshing action with the toothed ring, and the eccentrically set drive shaft rotates with the gear to make a circular motion, periodically pushing against the inner wall of the frame plate. With the sliding guide of the slider and the annular groove, the frame plate generates radial reciprocating oscillation while rotating circumferentially with the drive disc. This, in turn, drives the scraper to make a compound motion of circumferential rotation and arc reciprocating oscillation along the upper surface of the filter plate. This can scrape off solid impurities trapped on the surface of the filter holes from multiple angles, avoid the accumulation of impurities that reduces the flow area of ​​the filter holes, maintain a stable filtration flux, and ensure the continuous and stable operation of the filtration process.

[0017] 2. This invention relies on the interlocking transmission of the scraper groove and the force rod to make the stirring blade superimpose radial reciprocating amplitude on the basis of circumferential stirring, forming a large-scale circumferential stirring flow field and a small-scale interlaced shear flow field inside the water body, thereby enhancing the mixing effect of flocculant and water. 3. During the stirring and flocculation process, the present invention utilizes an annular float to move the lifting rod and the extrusion block upwards as the liquid level rises. The vertical displacement is converted into the circumferential deflection of the sleeve by the inclined surface of the curved groove. Then, the top plate pushes the transverse rod to move radially outwards, amplifying the swing amplitude of the stirring rod. At low liquid levels, a smaller stirring width is maintained to avoid excessive shear strength that could cause floc breakage. At high liquid levels, the stirring angle coverage is expanded to improve the mixing intensity of the water, adapting to the flocculation reaction requirements under different water volumes and shortening the overall purification cycle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a first sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of the structure of region A; Figure 4 This is a cross-sectional view of the overhead slab structure of the present invention; Figure 5 This is a partial structural diagram of the anti-clogging component of the present invention; Figure 6 This is a second sectional view of the overall structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of the structure of region B; Figure 8 This is a schematic diagram of the structure of the sleeve of the present invention.

[0019] In the diagram: 1. Tank body; 2. Filter plate; 3. Sewage outlet; 4. Drain outlet; 5. Gear ring; 6. Horizontal frame; 7. Overhead plate; 8. Drive motor; 901. Drive disc; 902. Annular groove; 903. Slider; 904. Frame plate; 905. Vertical frame; 906. Round shaft; 907. Gear; 909. Drive shaft; 910. Drive rod; 911. Scraper; 912. Long groove; 101. Drive block; 102. Stirring rod; 103. Stirring blade; 104. Horizontal movement rod; 105. Force rod; 106. Sleeve; 107. Curved groove; 108. Lifting rod; 109. Extrusion block; 110. Annular float plate; 111. Top plate. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0021] Please see Figures 1-8 This invention provides a technical solution: a multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration, comprising a tank 1, a detachable filter plate 2 in the middle of the tank 1, a drain outlet 3 at the lower end of the tank 1, a drain outlet 4 on the side wall of the tank 1, a toothed ring 5 at the upper end of the tank 1, the toothed ring 5 being connected to the inner wall of the tank 1 via a crossbeam 6, an overhead plate 7 being installed at the upper end of the crossbeam 6, a drive motor 8 being installed at the upper end of the overhead plate 7, the output end of the drive motor 8 passing through the overhead plate 7 and extending to the lower end of the filter plate 2; an anti-clogging component is provided between the toothed ring 5 and the overhead plate 7 for cleaning the filter plate 2; a flocculation component is provided below the motor output end for flocculating the filtered wastewater; Wastewater is injected into the device from the top of tank 1. The wastewater first falls to the upper surface of filter plate 2 and passes through the filter holes of filter plate 2 to trap impurities and suspended solids in the wastewater. The filtered wastewater passes through the filter holes and enters the lower chamber of tank 1. The drive motor 8 is started, which drives the anti-clogging component and the flocculation component to move. This can scrape off the dirt trapped on the surface of filter plate 2 and also stir the water in the lower chamber to promote the uniform mixing of flocculant and water, and accelerate the formation and sedimentation of flocs.

[0022] As one embodiment of the present invention, the anti-clogging component includes a drive disk 901 disposed between the toothed ring 5 and the overhead plate 7. The drive disk 901 is connected to the motor output end. An annular groove 902 is provided at the lower end of the drive disk 901. A symmetrically arranged slider 903 is slidably connected in the annular groove 902. A frame plate 904 is connected to the lower end of each slider 903. The frame plate 904 is in the shape of a rectangular frame. The lower end of the drive disc 901 is connected to symmetrically arranged vertical brackets 905. The two vertical brackets 905 are rotatably connected to round shafts 906 on the opposite sides. Gears 907 are installed at the ends of the round shafts 906. The gears 907 mesh with the toothed rings 5. The end face of the gears 907 away from the center is connected to a drive shaft 909. The drive shafts 909 are movably inserted into the hollow part of the frame plate 904. The lower end of the frame plate 904 is connected to a drive rod 910. The lower end of the drive rod 910 is connected to a scraper 911. The scraper 911 abuts against the upper end face of the filter plate 2. The upper end face of the scraper 911 is provided with a long groove 912. During the rotation of the drive motor 8, the output end of the drive motor 8 drives the drive disk 901 to rotate circumferentially. The two sets of vertical supports 905 fixed at the lower end of the drive disk 901 revolve together with the drive disk 901. The vertical supports 905 drive the gear 907 to rotate through the round shaft 906. While the gear 907 revolves around the center with the vertical supports 905, the toothed ring 5 squeezes the gear 907. Under the reaction force of the tooth surface of the toothed ring 5, the gear 907 rotates around the axis of the round shaft 906. The drive shaft 909 then rotates with the gear 907. The rotating drive shaft 909 periodically squeezes the inner wall of the frame plate 904, driving... The frame plate 904 generates radial reciprocating oscillation. A slider 903 is fixed at the upper end of the frame plate 904. The annular groove 902 provides limit and guidance for the slider 903, so that the frame plate 904 revolves with the drive disk 901 while superimposing the radial reciprocating oscillation action. The frame plate 904 then drives the scraper 911 to move through the drive rod 910. The scraper 911 rotates in the same circumferential direction as the frame plate 904 and performs a combined action of radial reciprocating arc oscillation, which scrapes the upper surface of the filter plate 2, scraping away the trapped impurities from the filter holes and preventing the filter holes from clogging. The combined action can form a two-way reciprocating scraping on the surface of the filter plate 2, effectively preventing clogging.

[0023] In one embodiment of the present invention, the flocculation component includes a drive block 101 installed at the output end of a motor. A protective cover is integrally formed on the upper end of the drive block 101. Two stirring rods 102 are rotatably connected to the drive block 101. Stirring blades 103 are connected to the side walls of the stirring rods 102. A transverse moving rod 104 is laterally connected to the upper end of the stirring rod 102. A force-bearing rod 105 is connected to the end of the transverse moving rod 104. The lower end of the force-bearing rod 105 is embedded in a long groove 912. A sleeve 106 is rotatably connected to the upper end of the drive block 101. A top plate 111 is connected to the outer wall of the sleeve 106. The top plate 111 abuts against the end of the transverse rod 104. The transverse rod 104 moves through the protective cover. A curved groove 107 is opened on the outer wall of the sleeve 106. Two lifting rods 108 are slidably connected to the drive block 101 corresponding to the curved groove 107. An extrusion block 109 is connected to the upper end of each of the two lifting rods 108. The extrusion block 109 is movably embedded in the curved groove 107. An annular float 110 is connected to the lower end of the two lifting rods 108. The output shaft of the drive motor 8 synchronously drives the drive block 101 fixed at the lower end to rotate. The drive block 101 drives the two stirring rods 102 to revolve. The stirring blades 103 fixed to the side wall of the stirring rods 102 rotate synchronously, and the rotating stirring blades 103 perform circumferential stirring of the wastewater in the lower chamber of the tank 1, promoting uniform mixing of the reagent and the water and triggering the flocculation reaction. Since a force-bearing rod 105 is fixed at the end of the transverse rod 104, and the lower end of the force-bearing rod 105 is embedded in the long groove 912 at the upper end of the scraper 911, when the scraper 911 makes radial reciprocating swing, the long groove The side wall of 912 exerts a lateral push on the force-bearing rod 105, causing the force-bearing rod 105 and the transverse rod 104 to swing. This, in turn, causes the stirring rod 102 to reciprocate around its rotational hinge point with the drive block 101. This causes the stirring blade 103 to superimpose its oscillating motion on top of its revolution, increasing the turbulence effect of the water and accelerating the flocculation reaction rate. In particular, the stirring rod 102 drives the stirring blade 103 to generate a radial reciprocating amplitude while moving in a circular motion. This can form an interlaced shear flow field inside the water, avoiding the formation of a stratified flow state from a single circular stirring, and improving the flocculation reaction efficiency.

[0024] As filtration continues, the liquid level in the lower chamber of tank 1 gradually rises. The annular float 110 floats on the liquid surface in the lower chamber and floats upward with the rising liquid level. When the annular float 110 rises, it drives the lifting rod 108 to move upward. The lifting rod 108 then drives the squeezing block 109 to move upward. The upward-moving squeezing block 109 squeezes the inclined surface of the curved groove 107. Since the sleeve 106 is rotatably mounted on the upper end of the drive block 101, the sleeve 106, subjected to the squeezing force of the inclined surface, deflects around its own axis. The top plate 111, which is fixedly connected to the outer wall of the sleeve 106, moves along with the sleeve 106. The top plate 111 deflects, and the deflected top plate 111 exerts a radial outward thrust on the inner end of the transverse rod 104, pushing the transverse rod 104 to slide outward. The transverse rod 104 then drives the force rod 105 to move along the long groove 912 on the scraper 911 in a direction away from the center of the tank 1. As the arc swing amplitude of the scraper 911 gradually increases with the position away from the center, the swing stroke of the force rod 105 increases synchronously after it moves outward. This further increases the swing amplitude of the stirring rod 102 through the transverse rod 104, and the swing angle range and turbulence intensity of the stirring blade 103 are increased accordingly. The higher the liquid level, the greater the amplitude of the stirring swing, which is adapted to the mixing requirements of a larger water volume under high liquid level, accelerates the formation and sedimentation of flocs, and shortens the overall flocculation and sedimentation cycle. Among them, the top plate 111 deflects with the sleeve 106 and pushes the transverse rod 104, so that the swing amplitude of the stirring rod 102 increases with the rise of the liquid level. At low liquid level, small stirring prevents the flocs from being excessively sheared and broken, while at high liquid level, large stirring ensures that the water in the whole cavity is mixed evenly, and the optimal flocculation and sedimentation effect can be maintained under different treatment water volumes.

[0025] Working principle: Wastewater is injected into the device from the top of tank 1. The wastewater first falls to the upper surface of filter plate 2 and impurities and suspended solids in the wastewater are intercepted through the filter holes of filter plate 2. The filtered wastewater enters the lower chamber of tank 1 through the filter holes, waiting for subsequent flocculation and sedimentation treatment. When the drive motor 8 is started, its output drives the drive disk 901 to rotate circumferentially. Two sets of vertical supports 905 fixed at the lower end of the drive disk 901 revolve together with it. The vertical supports 905 drive the gear 907 to rotate via the round shaft 906. As the gear 907 revolves around the center with the vertical supports 905, the toothed ring 5 exerts pressure on it. Under the reaction force of the toothed ring 5, the gear 907 rotates around the axis of the round shaft 906. The drive shaft 909 then rotates along with the gear 907. The periodic compression of the inner wall of the frame plate 904 causes the frame plate 904 to oscillate radially. A slider 903 is fixed at the upper end of the frame plate 904. The annular groove 902 provides a limit and guide for the slider 903, so that the frame plate 904 rotates with the drive disk 901 while simultaneously performing a radial reciprocating oscillation. The frame plate 904 then drives the scraper 911 to move through the drive rod 910. The scraper 911 performs a combined action of circumferential rotation and radial reciprocating arc oscillation with the frame plate 904, scraping the upper surface of the filter plate 2 and removing the trapped impurities from the filter holes to prevent the filter holes from clogging.

[0026] The output shaft of the drive motor 8 synchronously drives the drive block 101 fixed at the lower end to rotate. The drive block 101 drives the two stirring rods 102 to revolve. The stirring blades 103 fixed on the side wall of the stirring rods 102 rotate synchronously. The rotating stirring blades 103 perform circumferential stirring of the wastewater in the lower chamber of the tank 1, promoting uniform mixing of the reagent and the water and triggering the flocculation reaction. Since the end of the transverse rod 104 is fixed with a force rod 105, the lower end of the force rod 105 is embedded in the long groove 912 at the upper end of the scraper 911. When the scraper 911 makes radial reciprocating swing, the side wall of the long groove 912 forms a lateral push against the force rod 105, causing the force rod 105 and the transverse rod 104 to swing. This in turn causes the stirring rod 102 to reciprocate around its rotational hinge point with the drive block 101, so that the stirring blades 103 have a superimposed swinging motion on the basis of the revolution, increasing the water turbulence effect and accelerating the flocculation reaction rate. As filtration continues, the liquid level in the lower chamber of tank 1 gradually rises. The annular float 110 floats on the liquid surface in the lower chamber and floats upward with the rising liquid level. When the annular float 110 rises, it drives the lifting rod 108 to move upward. The lifting rod 108 then drives the squeezing block 109 to move upward. The upward-moving squeezing block 109 squeezes the inclined surface of the curved groove 107. Since the sleeve 106 is rotatably mounted on the upper end of the drive block 101, the sleeve 106, subjected to the squeezing force of the inclined surface, deflects around its own axis. The top plate 111, which is fixedly connected to the outer wall of the sleeve 106, moves along with the sleeve 106. The top plate 111 deflects, and the deflected top plate 111 exerts a radially outward thrust on the inner end of the transverse rod 104, pushing the transverse rod 104 to slide outward. The transverse rod 104 then drives the force rod 105 to move along the long groove 912 on the scraper 911 away from the center of the tank 1. As the arc swing amplitude of the scraper 911 gradually increases with the distance from the center, the swing stroke of the force rod 105 increases synchronously after it moves outward. This, in turn, drives the swing amplitude of the stirring rod 102 to further increase through the transverse rod 104, and the swing angle range and turbulence intensity of the stirring blade 103 are thus increased. The higher the liquid level, the greater the swing amplitude, which is suitable for the mixing requirements of larger water volumes at high liquid levels, accelerates the formation and sedimentation of flocs, and shortens the overall flocculation and sedimentation cycle.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration, comprising a tank (1), wherein a detachable filter plate (2) is provided in the middle of the tank (1), a drain outlet (3) is provided at the lower end of the tank (1), and a drain outlet (4) is provided on the side wall of the tank (1), characterized in that: The upper end of the tank (1) is provided with a toothed ring (5), which is connected to the inner wall of the tank (1) through a cross frame (6). A suspended plate (7) is installed on the upper end of the cross frame (6), and a drive motor (8) is installed on the upper end of the suspended plate (7). The output end of the drive motor (8) passes through the suspended plate (7) and extends to the lower end of the filter plate (2). An anti-clogging component is provided between the toothed ring (5) and the overhead plate (7) for cleaning the filter plate (2); The lower end of the motor output terminal is equipped with a flocculation component for flocculating the filtered wastewater.

2. The multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration according to claim 1, characterized in that: The anti-clogging component includes a drive disk (901) disposed between the toothed ring (5) and the overhead plate (7). The drive disk (901) is connected to the motor output end, and an annular groove (902) is provided at the lower end of the drive disk (901).

3. The multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration according to claim 2, characterized in that: The annular groove (902) is slidably connected to a slider (903), and the lower end of each slider (903) is connected to a frame plate (904), which is in the shape of a rectangular frame.

4. The multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration according to claim 3, characterized in that: The lower end of the drive disc (901) is connected to a symmetrically arranged vertical bracket (905), and a round shaft (906) is rotatably connected to the side of the two vertical brackets (905) that are far apart from each other. A gear (907) is installed at the end of each round shaft (906).

5. The multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration according to claim 4, characterized in that: The gear (907) meshes with the face ring (5), and the end face of the gear (907) away from the center is connected to a drive shaft (909). The drive shaft (909) is movably inserted into the hollow part of the frame plate (904).

6. The multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration according to claim 5, characterized in that: The lower end of each frame plate (904) is connected to a drive rod (910), and the lower end of each drive rod (910) is connected to a scraper (911). The scraper (911) is in contact with the upper surface of the filter plate (2), and the upper surface of the scraper (911) is provided with a long groove (912).

7. The multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration according to claim 1, characterized in that: The flocculation component includes a drive block (101) installed at the output end of a motor. A protective cover is integrally formed on the upper end of the drive block (101). Two stirring rods (102) are rotatably connected to the drive block (101), and stirring blades (103) are connected to the side walls of the stirring rods (102).

8. The multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration according to claim 7, characterized in that: The upper end of the stirring rod (102) is connected to a transverse rod (104), and each end of the transverse rod (104) is connected to a force rod (105). The lower end of the force rod (105) is embedded in a long groove (912).

9. The multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration according to claim 8, characterized in that: The upper end of the drive block (101) is rotatably connected to a sleeve (106), and the outer wall of the sleeve (106) is connected to a top plate (111). The top plate (111) abuts against the end of the transverse rod (104). The transverse rod (104) moves through the protective cover. The outer wall of the sleeve (106) is provided with a curved groove (107). The drive block (101) is slidably connected to two lifting rods (108) corresponding to the curved groove (107).

10. The multi-stage purification device for laboratory wastewater integrating stratified sedimentation and filtration according to claim 9, characterized in that: Both of the lifting rods (108) are connected to an extrusion block (109) at their upper ends. The extrusion block (109) is movably embedded in the curved groove (107). The lower ends of the two lifting rods (108) are connected to an annular float plate (110).

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