A rare earth production waste gas treatment spray tower

Abstract

The present invention provides a rare earth production waste gas treatment spray tower, comprising a tower body and a pumping device, the tower body comprising a tower bottom, a tower cover, and at least one tower body installed between the tower bottom and the tower cover, the side walls of the tower body being provided with windows, the outsides of the windows being provided with viewing windows; the tower cover and the bottom of the tower body being provided with spray devices, the pumping device being used to pump spray liquid to each spray device; a slag discharge port being provided below the window, the outsides of the slag discharge port being provided with a cover plate; a mesh frame for placing fillers being provided in a rotating manner inside the tower body, a discharge port being provided on the side walls of the mesh frame, the bottom of the discharge port being flush with the bottom of the slag discharge port; an adjusting structure for driving the mesh frame to rotate being provided in the tower body, the adjusting part of the adjusting structure extending to the window; the adjusting structure being adjusted to drive the mesh frame to rotate so that the fillers inside are discharged from the slag discharge port, so that the fillers inside can be taken out, the difficulty of replacing the fillers is reduced, the time for replacing the fillers is shortened, and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of spray towers, and more particularly to a spray tower for treating waste gas from rare earth production. Background Art

[0002] During the rare earth processing and production process, a large amount of waste gas is generated, which needs to be treated in a spray tower before it can be discharged. Among them, the packed spray tower is a common type. The internal packing increases the contact area between the spray liquid and the waste gas and provides a place for microorganisms to attach, effectively improving the overall purification efficiency and quality.

[0003] However, it also has an obvious defect. At present, the filler is replaced by taking it out and putting it in through the window. Especially when the filler is taken out, due to the certain height difference between the window and the support net, it is very difficult to take out the internal filler. It is also necessary to use a hook rake to hook it, which is troublesome to operate and requires a lot of manpower and time. Therefore, it needs to be improved. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a rare earth production waste gas treatment spray tower so that the internal filler can be removed, the difficulty of filler replacement can be reduced, the time of filler replacement can be shortened, and the efficiency can be improved.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a rare earth production waste gas treatment spray tower, comprising a tower body and a pumping device, wherein the tower body comprises a tower bottom, a tower cover, and at least one tower body layer installed between the tower bottom and the tower cover, wherein the side walls of the tower body are provided with windows, and the outer sides of the windows are provided with viewing windows; the tower cover and the bottom of the tower body are provided with spray devices, and the pumping device is used to pump spray liquid to each spray device; a slag discharge port is provided below the window, and a cover plate is provided on the outer side of the slag discharge port; a mesh frame for placing fillers is provided in a rotating manner inside the tower body, and a discharge port is provided on the side wall of the mesh frame, and the bottom of the discharge port extends to the bottom inner wall of the mesh frame, and the bottom of the discharge port is flush with the bottom of the slag discharge port; an adjusting structure for driving the mesh frame to rotate is provided in the tower body, and the adjusting part of the adjusting structure extends to the window; the adjusting structure is adjusted to drive the mesh frame to rotate so that the fillers inside are discharged from the slag discharge port.

[0007] In a preferred technical solution of the present invention, the spray device includes a grid and a spray pipe group installed at the bottom of the grid, a nozzle is provided at the bottom of the spray pipe group, and the grid is fixedly installed on the tower body; a support ring is fixedly provided on the edge of the top surface of the grid, and a plurality of countersunk holes are provided on the support ring, and the countersunk holes are distributed in an array around the center circumference of the support ring; a universal ball bearing is installed at each countersunk hole, and the ball of the universal ball bearing protrudes from the top surface of the support ring; the grid frame is rollingly supported by a plurality of universal ball bearings, and the grid frame rotates close to the inner wall of the tower body.

[0008] In a preferred technical solution of the present invention, the mesh frame includes a mesh plate, a plurality of vertical poles fixedly arranged at the edge of the mesh plate, and a support ring fixedly arranged at the top of the vertical pole; a discharge port is formed between two adjacent vertical poles; the mesh plate is rotatably arranged above the corresponding spray device; the outer diameter of the support ring and the mesh plate is adapted to the inner diameter of the tower body; the top surface of the support ring is provided with a toothed ring, and the teeth of the toothed ring are arranged upward;

[0009] The adjusting structure is arranged above the gear ring. The adjusting structure is provided with an adjustable rotatable gear. The gear is engaged with the gear ring to drive the screen frame to rotate.

[0010] In a preferred technical solution of the present invention, the adjustment structure includes a gear, a bracket, and a rotating shaft; the bracket is installed on the tower body by bolts, the bracket spans the top of the net frame, and one end of the bracket extends to the window; the rotating shaft is rotatably installed on the bracket, and one end of the rotating shaft passes through the bracket and extends to the window, which is used to cooperate with the external adjustment handwheel; the gear is fixed on the rotating shaft.

[0011] In a preferred technical solution of the present invention, a material guide structure is installed on the top of the grid plate. The material guide structure can be adjusted to form a frustum-shaped structure with an upward bulge in the middle, which is used to push the filler toward the edge.

[0012] In a preferred technical solution of the present invention, the material guiding structure includes a pull plate and a plurality of rack bars; a top surface of the grid plate is fixedly provided with a plurality of first clamping grooves protruding upward, and the plurality of first clamping grooves are distributed in an array around the central circumference of the grid plate; a first circular hole is provided at the first clamping groove that passes through both sides; a plurality of second clamping grooves protruding outward are fixedly provided at the edge of the pull plate, and the second clamping grooves are distributed in an array around the central circumference of the pull plate and correspond to the positions of the first clamping grooves; a second circular hole is provided at the second clamping groove that passes through both sides; a third circular hole is provided at one end of the rack bar, and a strip hole extending along the length direction is provided at the other end; one end of the rack bar provided with the third circular hole is rotatably mounted on the first clamping groove through a first pin shaft, and the other end is slidably engaged with the second clamping groove through a second pin shaft penetrating the strip hole and the second circular hole;

[0013] A cable is fixed in the middle of the top surface of the pull plate. By dragging the cable, the pull plate is lifted, and the material guide structure is transformed into a frustum-shaped structure with the middle part bulging upward.

[0014] In a preferred technical solution of the present invention, a hanging ring assembly is rotatably installed at the bottom of the bracket, and the hanging ring assembly is biased to one side of the center of the pull plate; a plurality of first hanging rings are fixedly provided on the inner wall of the support ring, and the first hanging rings are distributed in a circular array around the axis of the support ring; a hook is fixedly installed at the end of the cable away from the pull plate, and the cable movably passes through the hanging ring assembly and is buckled at the first hanging ring through the hook; when the screen frame rotates, the cable is dragged to cause the material guide structure to rise and fall and deform.

[0015] In a preferred technical solution of the present invention, the lifting ring assembly includes a lifting ring and a swivel; the swivel includes a pressure plate, a convex column fixedly arranged on the bottom surface of the pressure plate, and a fourth circular hole correspondingly provided on the bracket, and the aperture of the fourth circular hole is adapted to the diameter of the convex column; a sleeve is fixedly provided on the top of the lifting ring, and the sleeve is installed on the bottom end of the convex column, and the lifting ring assembly is rotatably installed at the fourth circular hole.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides a rare earth production waste gas treatment spray tower. A slag discharge port is provided below a window of the tower body, and a cover plate is installed on the outside of the slag discharge port. A mesh frame for placing fillers is rotatably provided inside the tower body, and a discharge port is provided on the side wall of the mesh frame. The bottom of the discharge port extends to the bottom inner wall of the mesh frame, and the bottom of the discharge port is flush with the bottom of the slag discharge port. By using the additional slag discharge port as a location for discharging fillers, there is no need to clean the window, which reduces the trouble caused by the height difference and facilitates operation.

[0018] In addition, an adjustment structure for driving the screen frame to rotate is provided in the tower body, and the adjustment part of the adjustment structure extends to the window. The adjustment structure is used to drive the screen frame to rotate, so that the internal filler is discharged from the slag discharge port. The screen frame can be rotated to change its position, which has a stirring effect on the filler and also allows the filler in the internal position to be smoothly brought out, thereby accelerating the unloading and discharging speed.

[0019] The design and coordination of the overall structure uses the window as the feeding part and the slag discharge port as the discharging part, and accelerates the discharging through the rotatable screen frame, which can effectively reduce the difficulty of packing replacement, shorten the time of packing replacement, and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a spray tower for treating waste gas from rare earth production provided in a specific embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the three-dimensional structure of the tower body provided in a specific embodiment of the present invention from a first perspective;

[0022] Figure 3 is a schematic diagram of the three-dimensional structure of the tower body provided in a specific embodiment of the present invention from a second perspective;

[0023] Figure 4 It is a schematic diagram of the three-dimensional expanded structure of the tower body provided in a specific embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the three-dimensional structure of the regulating structure provided in a specific embodiment of the present invention;

[0025] Figure 6is a schematic diagram of a three-dimensional unfolded structure of an adjustment structure provided in a specific embodiment of the present invention;

[0026] Figure 7 2. It is a schematic diagram of the three-dimensional unfolded structure of the screen frame and the adjustment structure provided in a specific embodiment of the present invention;

[0027] Figure 8 is a schematic diagram of the three-dimensional structure of a screen frame provided in a specific embodiment of the present invention;

[0028] Figure 9 is a schematic diagram of the three-dimensional structure of the rack provided in a specific embodiment of the present invention;

[0029] Figure 10 It is a schematic diagram of the state of the material guiding structure provided in a specific embodiment of the present invention after being raised.

[0030] In the picture:

[0031] 110, tower bottom; 120, tower cover; 130, spray device; 131, grid; 132, support ring; 133, countersunk hole; 134, universal ball bearing;

[0032] 200, tower body; 210, window; 220, slag discharge port;

[0033] 300, mesh frame; 310, mesh plate; 311, first clamping groove; 320, vertical pole; 330, support ring; 340, discharge port; 350, gear ring; 360, material guide structure; 361, pull plate; 3611, second clamping groove; 362, frame bar; 3621, strip hole; 363, cable; 364, hook; 370, first hanging ring;

[0034] 400, adjustment structure; 410, gear; 420, bracket; 421, fourth circular hole; 430, rotating shaft; 440, lifting ring assembly; 441, lifting ring; 442, rotating head. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] like Figures 1 to 4As shown, a specific embodiment of the present invention discloses a rare earth production waste gas treatment spray tower, including a tower body and a pumping device. The tower body includes a tower bottom 110, a tower cover 120, and at least one tower body 200 installed between the tower bottom and the tower cover. The side wall of the tower body 200 is provided with a window 210, and the outside of the window is provided with a viewing window; the tower cover and the bottom of the tower body are provided with a spray device 130, and the pumping device is used to pump the spray liquid to each spray device; a slag discharge port 220 is provided below the window 210, and the slag discharge port A cover plate is installed on the outside of the tower body 200; a mesh frame 300 for placing fillers is provided inside the tower body 200, and a discharge port 340 is provided on the side wall of the mesh frame 300. The bottom of the discharge port extends to the bottom inner wall of the mesh frame, and the bottom of the discharge port 340 is flush with the bottom of the slag discharge port 220; an adjusting structure 400 for driving the mesh frame to rotate is provided inside the tower body 200, and the adjusting part of the adjusting structure extends to the window; the adjusting structure 400 is used to drive the mesh frame 300 to rotate after adjustment, so that the internal fillers are discharged from the slag discharge port.

[0037] The above-mentioned rare earth production waste gas treatment spray tower uses an additional slag discharge port as the location for filling material to be discharged, eliminating the need for cleaning at the window, reducing the trouble caused by the height difference, and facilitating operation;

[0038] Moreover, the screen frame can be adjusted to rotate, so that the position can be changed back and forth, which can stir the filler and make the filler in the internal position be brought out smoothly, thereby accelerating the unloading and discharge speed; the design and coordination of the overall structure, with the window as the feeding position and the slag discharge port as the discharge position, and the rotatable screen frame to accelerate the discharge, can effectively reduce the difficulty of filler replacement, shorten the time of filler replacement, and improve efficiency; it should be noted that the spray tower is a relatively mature purification equipment, and the equipment structure matched with the air intake, exhaust, and pumping device is well known, and the details will not be repeated; for the present invention, in actual use, a spherical filler structure is preferred, which is more convenient for external discharge and cleaning; and the diameter of the filler is larger than the bottom notch of the screen frame to prevent affecting the operation of other structural components.

[0039] Further, if Figure 4 As shown, the spray device 130 includes a grid 131 and a spray pipe group installed at the bottom of the grid, a nozzle is provided at the bottom of the spray pipe group, and the grid is fixedly installed on the tower body; a support ring 132 is fixedly provided on the top edge of the grid 131, and a plurality of countersunk holes 133 are provided on the support ring 132, and the countersunk holes are distributed in an array around the central circumference of the support ring; a universal ball bearing 134 is installed at each countersunk hole 133, and the ball of the universal ball bearing protrudes from the top surface of the support ring; the net frame 300 is rollingly supported by a plurality of universal ball bearings 134, and the net frame 300 rotates close to the inner wall of the tower body 200; this structure can leave a distance between the net frame and the grid, and the universal ball bearing is used as a rolling support component to reduce the difficulty of rotating the net frame and facilitate subsequent adjustment operations.

[0040] Furthermore, if Figure 7 、 Figure 8 As shown, the screen frame 300 includes a mesh plate 310, a plurality of vertical rods 320 fixedly arranged at the edge of the mesh plate 310, and a support ring 330 fixedly provided at the top of the vertical rods 320; a discharge port 340 is formed between two adjacent vertical rods 320, providing sufficient discharge space without affecting the discharge of the filler from the screen frame;

[0041] The mesh plate 310 is rotatably arranged above the corresponding spray device 130; the outer diameter of the support ring 330 and the mesh plate 310 is adapted to the inner diameter of the tower body 200; a gear ring 350 is provided on the top surface of the support ring 330, and the teeth of the gear ring are set upward; the adjustment structure 400 is arranged above the gear ring 350, and an adjustable rotatable gear 410 is provided on the adjustment structure 400. The gear 410 is engaged with the gear ring 350 to drive the mesh frame to rotate. The adjustment action is completed using a simple rotating structure, which is easy to operate.

[0042] Furthermore, if Figures 4 to 6 As shown, the adjustment structure 400 includes a gear 410, a bracket 420, and a rotating shaft 430; the bracket 420 is mounted on the tower body 200 by bolts, the bracket 420 spans the top of the screen frame 300, and one end of the bracket 420 extends to the window 210; the rotating shaft 430 is rotatably mounted on the bracket 420, and one end of the rotating shaft 430 passes through the bracket and extends to the window 210, for cooperating with an external adjustment handwheel; the gear 410 is fixed on the rotating shaft 430;

[0043] More specifically, the bracket includes two relatively arranged support bars, one end of the two support bars is fixedly provided with a first docking plate, and the other end is fixedly provided with a second docking plate; the outer wall of the first docking plate is arc-shaped, adapted to the shape of the inner wall of the tower body, and the first docking plate is fixed to the inner wall of the tower body by bolts; the outer wall of the second docking plate is fixedly provided with a flange, the shape of the flange is adapted to the shape of the inner wall of the window, and the flange is fixed to the inner wall of the window by bolts; so that the bracket is fixedly installed at the tower body; an insert is fixedly provided at the middle of the inner wall of the first docking plate, and a fifth circular hole is correspondingly provided on the second docking plate, and the rotating shaft is rotatably mounted at the insert and the fifth circular hole; the whole is a detachable structure, which is convenient for the processing and production of various structural components, and is also convenient for assembly and installation, and is also convenient for installation to the tower body; wherein, a hand wheel is required for adjustment, a clamping sleeve is fixedly provided at the center of the hand wheel, and a prismatic block is fixedly provided at the end of the rotating shaft away from the insert, and the clamping sleeve can be sleeved on the prismatic block and docked, so that the rotating shaft can be rotated to achieve the required adjustment.

[0044] Furthermore, if Figure 8 、 Figure 10As shown, a material guide structure 360 ​​is installed on the top of the grid plate 310. The material guide structure can be adjusted to form a cone-shaped structure with an upward bulge in the middle, which is used to push the filler toward the edge, accelerate the movement of the filler to the side discharge port, and facilitate external discharge.

[0045] Furthermore, if Figure 8 The cam 362 is a block 364 that is fixed to the top of the cam 362 and is fixed to the top of the cam 362. The cam 362 is a block 364 that is fixed to the top of the cam 362 and is fixed to the bottom of the cam 362. Figure 10 As shown, the material guide structure is deformed into a frustum-shaped structure with an upward bulge in the middle. This structural design allows the material guide structure to have a basis for deformation. Before deformation, it maintains a flat position to prevent the filler from piling up unevenly and avoids the filler from gathering on one side and affecting the flow and distribution of the spray liquid and exhaust gas, thereby ensuring uniform overall distribution and intersection and purification effect. When discharge is required, the material guide structure can be adjusted to bulge, so that the filler rolls to the edge. The back-and-forth adjustment of the deformation can also have a stirring effect, thereby accelerating the discharge of the filler. Moreover, after adding new filler, the filler can be stirred by rotating the mesh frame and adjusting the material guide structure to make it evenly distributed, thereby preventing the filler from piling up on the side close to the window.

[0046] Furthermore, if Figure 5 、 Figure 6 As shown, a lifting ring assembly 440 is rotatably mounted on the bottom of the bracket 420, and the lifting ring assembly 440 is offset to one side of the center of the pull plate 361; a plurality of first hanging rings 370 are fixedly provided on the inner wall of the support ring 330, and the first hanging rings are distributed in a circular array around the axis of the support ring;

[0047] like Figure 7 、 Figure 8 As shown, the end of the cable 363 away from the pull plate 361 is fixedly mounted with a hook 364, as shown in FIG. Figure 4As shown, the cable 363 is movable through the hanging ring assembly 440 and is buckled at the first hanging ring 370 through the hanging buckle 364; when the screen frame rotates, the cable is dragged to cause the material guide structure to rise and fall and deform; this structural design allows the material guide structure to rise and fall and deform back and forth as the screen frame rotates, without the need for additional adjustment, easy to operate, and can effectively accelerate the discharge of fillers.

[0048] Furthermore, if Figure 6 As shown, the lifting ring assembly 440 includes a lifting ring 441 and a swivel 442; the swivel includes a pressure plate, a convex column fixedly arranged on the bottom surface of the pressure plate, and a fourth circular hole 421 is correspondingly provided on the bracket 420, and the aperture of the fourth circular hole is adapted to the diameter of the convex column; a sleeve is fixedly provided on the top of the lifting ring, and the sleeve is sleeved and installed on the bottom end of the convex column, and the lifting ring assembly 440 is rotatably installed at the fourth circular hole 421; the sleeve is connected to the convex column by a bolt or a pin, which does not affect the rotation effect required by the lifting ring assembly and also prevents the lifting ring from loosening and falling from the swivel; a frame plate is fixedly installed on the two support bars, the fourth circular hole is provided at the center of the frame plate, and the lifting ring assembly is installed on the frame plate;

[0049] The distance from the lifting ring assembly to the pull plate axis is within the range of 1 / 3 to 2 / 3 of the screen frame radius. The appropriate position can be selected according to different screen frame depths and lifting height requirements, so that the material guide structure can be transformed into a frustum when being dragged by the cable, allowing the internal filler balls to roll around.

[0050] The present invention is described through preferred embodiments. Those skilled in the art will appreciate that various modifications or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A rare earth production waste gas treatment spray tower, comprising a tower body and a pumping device, wherein the tower body comprises a tower bottom, a tower cover, and at least one tower body layer installed between the tower bottom and the tower cover, wherein the side walls of the tower body are provided with windows, and the outer sides of the windows are provided with viewing windows; spray devices are installed at the bottom of the tower cover and the tower body, and the pumping device is used to pump spray liquid to each spray device; characterized in that: There is a slag discharge port below the window, and a cover plate is installed on the outside of the slag discharge port; The inner part of the tower body is provided with a mesh frame for placing fillers, and the side wall of the mesh frame is provided with a discharge port, the bottom of the discharge port extends to the bottom inner wall of the mesh frame, and the bottom of the discharge port is flush with the bottom of the slag discharge port; An adjustment structure is provided inside the tower body for driving the screen frame to rotate, and the adjustment part of the adjustment structure extends to the window. After adjustment, the adjustment structure is used to drive the screen frame to rotate, so that the internal filler is discharged from the slag discharge port. The mesh frame includes a mesh plate, a plurality of vertical poles fixedly arranged at the edge of the mesh plate, and a support ring fixedly arranged at the top of the vertical pole; a discharge port is formed between two adjacent vertical poles; the mesh plate is rotatably arranged above the corresponding spray device; the outer diameter of the support ring and the mesh plate is adapted to the inner diameter of the tower body; the top surface of the support ring is provided with a gear ring, and the teeth of the gear ring are arranged upward; an adjustment structure is provided above the gear ring, and the adjustment structure is provided with an adjustable rotatable gear, which meshes with the gear ring to drive the mesh frame to rotate; The adjustment structure includes a gear, a bracket, and a rotating shaft. The bracket is installed on the tower body by bolts, spanning the top of the screen frame, and one end of the bracket extends to the window. The rotating shaft is rotatably mounted on the bracket, and one end of the rotating shaft passes through the bracket and extends to the window for cooperating with the external adjustment hand wheel. The gear is fixed on the rotating shaft. A material guide structure is installed on the top of the grid plate. The material guide structure can be adjusted to form a cone-shaped structure with an upward bulge in the middle, which is used to push the filler toward the edge; the material guide structure includes a pull plate and a plurality of racks; the top surface of the grid plate is fixed with a plurality of first clamping grooves protruding upward, and the plurality of first clamping grooves are distributed in an array around the central circumference of the grid plate; the first clamping grooves are provided with first circular holes running through both sides; the edge of the pull plate is fixed with a plurality of second clamping grooves protruding outward, and the second clamping grooves are distributed in an array around the central circumference of the pull plate and correspond to the positions of the first clamping grooves; the second clamping grooves are fixed with a plurality of second clamping grooves protruding outward, and the second clamping grooves are distributed in an array around the central circumference of the pull plate and correspond to the positions of the first clamping grooves; A second circular hole is provided through both sides; a third circular hole is provided at one end of the frame bar, and a strip hole extending along the length direction is provided at the other end; one end of the frame bar provided with the third circular hole is rotatably mounted on the first clamping groove through a first pin shaft, and the other end is slidably engaged with the second clamping groove through a second pin shaft penetrated through the strip hole and the second circular hole; a cable is fixedly provided at the middle of the top surface of the pull plate, and the pull plate is lifted by dragging the cable, so that the material guide structure is deformed into a frustum-shaped structure with the middle part bulging upward; a lifting ring assembly is rotatably mounted on the bottom of the bracket, and the lifting ring assembly is biased to one side of the center of the pull plate; A plurality of first hanging rings are fixedly provided on the inner wall of the support ring, and the first hanging rings are distributed in a circular array around the axis of the support ring; a hook is fixedly installed on the end of the cable away from the pull plate, and the cable runs through the hanging ring assembly and is buckled at the first hanging ring through the hook; when the screen frame rotates, the cable is dragged to cause the material guide structure to rise and fall and deform.

2. A rare earth production waste gas treatment spray tower according to claim 1, characterized in that: The spraying device includes a grid and a spray pipe group installed at the bottom of the grid. A nozzle is provided at the bottom of the spray pipe group. The grid is fixedly installed on the tower body. A support ring is fixed on the edge of the top surface of the grid, and a plurality of countersunk holes are arranged in an array around the central circumference of the support ring; a universal ball bearing is installed at each countersunk hole, and the ball of the universal ball bearing protrudes from the top surface of the support ring; The net frame is supported by multiple universal ball bearings and rotates close to the inner wall of the tower.

3. The rare earth production waste gas treatment spray tower according to claim 1, characterized in that: The lifting ring assembly includes a lifting ring and a swivel; The rotating head includes a pressing plate, a convex column fixed on the bottom surface of the pressing plate, and a fourth circular hole correspondingly provided on the bracket, the aperture of the fourth circular hole being adapted to the diameter of the convex column; A sleeve is fixedly provided on the top of the lifting ring, the sleeve is sleeved and installed on the bottom end of the convex column, and the lifting ring component is rotatably installed at the fourth circular hole.

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