CN215844138U - Self-suction type dust removal system for automatic catalyst screening - Google Patents

Abstract

The utility model relates to the technical field of catalyst production, in particular to a self-suction type dust removal system for automatically screening a catalyst; the utility model comprises a base, a PLC control cabinet, an air compressor, a group of cyclone separators, a vibrating screen, a dust remover, a star-shaped blanking machine, a screw conveyor and a Roots blower, wherein the PLC control cabinet is detachably arranged on the base, the cyclone separators are arranged in a group, the vibrating screen is arranged in the base, the dust remover is arranged in the base, the star-shaped blanking machine is arranged in the base, the screw conveyor is arranged in the base, a group of strip-shaped grooves are arranged in the sieve plate in a linear array mode at equal intervals in the transverse direction, strip-shaped air bags matched with the strip-shaped grooves are arranged in the strip-shaped grooves, 1-10 sieve pores with different pore diameters are arranged on the same sieve plate, the pore diameters of all the corresponding sieve pores on the same strip-shaped groove are the same, the sieve pores with different pore diameters are distributed in a staggered mode in the transverse direction of the sieve plate, and the bottom of the vibrating screen is connected with an installation support through a main damping spring and a group of auxiliary springs; the utility model can effectively solve the problems of poor efficiency, poor flexibility, large equipment loss and the like in the prior art.

Description

Self-suction type dust removal system for automatic catalyst screening

Technical Field

The utility model relates to the technical field of catalyst production, in particular to a self-suction type dust removal system for automatically screening a catalyst.

Background

The role of the catalyst in various chemical reactions is very important, with granular catalysts being the most common type of catalyst. The types of catalysts used in different chemical reactions are different, the catalytic efficiency of the catalyst is seriously influenced by continuous abrasion or carbon deposition generated during operation of the catalyst in the using process, and the catalyst is ineffective under serious conditions so as to influence the whole reaction process.

In order to avoid the influence of the broken catalyst particles and the carbon deposition catalyst on the reaction system, the catalyst particles which run for a certain period need to be screened, the invalid catalyst particles are separated, and the catalyst particles which meet the requirements are reserved.

In the application number: the patent document CN202022319942.X discloses a precise catalyst dedusting vibrating screen, which comprises a base and a screening box, wherein the base is arranged below the screening box, a plurality of groups of springs are arranged between the base and the screening box, vibrating motors are arranged on two sides of the screening box, a box sealing cover is arranged on the top of the screening box, a feeding hole is formed in one side of the top end of the box sealing cover, and the other side of the top end of the box sealing cover is communicated with an external exhaust fan; a plurality of layers of screen meshes are arranged in the screening box from top to bottom, the mesh number of the plurality of layers of screen meshes is sequentially increased from top to bottom, each layer of screen mesh corresponds to one discharge port, a discharge disc is arranged at each discharge port, and the discharge discs are arranged in a downward inclined manner; the bottom of the screening box is provided with a material collecting box, one side of the upper part of the material collecting box is provided with an air inlet, and the air inlet is communicated with an air blower. The utility model can sieve in multiple stages, the effective catalyst can be accurately collected for reuse, the production cost is saved, and the blocking probability of the screen is reduced; and the dust produced in the screening process can be effectively absorbed and treated, so that the dust pollution is prevented.

However, the following disadvantages still exist in the practical application process:

firstly, the efficiency is poor, since in order to prevent cross-contamination of the raw materials or products, there is in fact a certain distance between different plants or plants, whereas the above-mentioned device can only treat the catalyst produced in one plant or plant at the same time, but not in a plurality of plants or plants at the same time.

Secondly, the flexibility is poor, because the filtering grade of the sieve plate in the vibrating screen is fixed, if the filtering grade of the sieve plate does not meet the actual requirement, the vibrating screen needs to be disassembled and the sieve plate corresponding to the filtering grade needs to be replaced, which undoubtedly increases the workload of users; and also increases costs because the user needs to prepare screen decks of different grades.

Thirdly, the equipment is more lossy because the vibration level of the vibrating screen generated under different powers is different, but the stiffness coefficient of the spring for damping is fixed, that is, the spring with different stiffness coefficient can achieve the best damping capacity corresponding to different vibration levels, so the spring for damping can not protect the vibrating screen well.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving the problems of the prior art, and the problems set forth in the background above.

In order to achieve the purpose, the utility model adopts the following technical scheme: a self-suction type dust removal system for automatic catalyst screening comprises a base, a PLC (programmable logic controller) control cabinet, an air compressor, a group of cyclone separators, a vibrating screen, a dust remover, a star-shaped blanking machine, a screw conveyor and a Roots blower, wherein the PLC control cabinet, the air compressor, the cyclone separators, the vibrating screen, the dust remover, the star-shaped blanking machine, the screw conveyor and the Roots blower are detachably mounted on the base;

the cyclone separators are connected in parallel, the feed inlets of one group of the cyclone separators are connected through a suction nozzle, the upper discharge outlets at the tops of one group of the cyclone separators are connected through a first branch pipe, the lower discharge outlets at the bottoms of one group of the cyclone separators are connected through a second branch pipe, the input end of the vibrating screen is connected with the input end of the vibrating screen through a first feeding pipe and the first branch pipe,

a group of sieve plates which are sequentially increased from top to bottom according to the filtering grade are arranged in the vibrating screen, discharge pipes which are in one-to-one correspondence with the sieve plates are arranged at the output end of the vibrating screen, the second branch pipe is connected with the bottom of the dust remover through a second feed pipe,

the bottom of the dust remover is respectively provided with a discharging pipe and a cleaning pipe, the bottom of the discharging pipe is connected with the input end of a star-shaped blanking machine, the output end of the star-shaped blanking machine is provided with a screw conveyor, and the top of the dust remover is connected with the input end of a Roots blower through a vent pipe;

the top end of the dust remover is also provided with a group of pulse valves, a knife valve is arranged at the pipe orifice of the cleaning pipe, a butterfly valve is arranged on each branch pipe of the suction nozzle, which is separately connected with each cyclone, and a butterfly valve is arranged on each branch pipe of the first branch pipe, which is separately connected with each cyclone;

the pulse valve, the knife valve and the butterfly valve are all powered by an air compressor, and the air compressor, the cyclone separator, the vibrating screen, the dust remover, the star-shaped blanking machine, the screw conveyor and the Roots blower are all controlled by a PLC control cabinet.

Furthermore, the dust remover is a bag type dust remover, and an exhaust pipe is arranged at the output end of the Roots blower.

Furthermore, the number of tapping pipes is at least 2.

Furthermore, a group of strip-shaped grooves are formed in the sieve plate in a transverse direction in an equidistant linear array mode, the algebraic difference value between the longitudinal length value of each strip-shaped groove and the longitudinal length value of the sieve plate is equal to the thickness value of the baffle between every two adjacent strip-shaped grooves, a group of sieve holes penetrate through the sieve plate in the region corresponding to each strip-shaped groove in the equidistant linear array mode in a longitudinal mode, the sieve holes are distributed in an eccentric mode relative to the projection of the corresponding strip-shaped grooves on the sieve plate, strip-shaped air bags matched with the strip-shaped grooves are arranged in the strip-shaped grooves, and the strip-shaped air bags are powered by air compressors.

Furthermore, the strip-shaped air bags are internally provided with strip-shaped fixed blocks matched with the strip-shaped air bags, when the air bags are completely contracted, the corresponding sieve holes in the strip-shaped grooves are completely communicated, and when the air bags are completely expanded, the corresponding sieve holes in the strip-shaped grooves are completely closed.

Furthermore, the same sieve plate is provided with 1-10 sieve holes with different apertures, the apertures of all the corresponding sieve holes on the same strip-shaped groove are the same, and the sieve holes with different apertures are distributed in a staggered manner in the transverse direction of the sieve plate.

Furthermore, the surfaces of the air bags are all coated with a layer of anti-cutting film.

Furthermore, a mounting bracket matched with the vibrating screen is arranged at the bottom of the vibrating screen, and the top corner of the bottom of the vibrating screen is connected with the corresponding strut on the mounting bracket through a main damping spring.

Further, the top of pillar is inwards sunken to be seted up flutedly, equal symmetry runs through on two opposite lateral walls on the pillar has the slot, all disassemble in the slot and have the picture peg, be equipped with a set of auxiliary spring symmetrically in the recess, auxiliary spring's quantity equals the quantity of picture peg, and auxiliary spring's top all is equipped with the picture peg, main damping spring contacts with the picture peg of recess notch department, and main damping spring's external diameter is less than the notch size of recess.

Compared with the prior art, the utility model has the advantages and positive effects that,

1. according to the utility model, the PLC control cabinet, the air compressor, the cyclone separators, the vibrating screen, the dust remover, the star-shaped blanking machine, the screw conveyor and the Roots blower are detachably mounted on the base, the cyclone separators are connected in parallel, feed inlets of a group of cyclone separators are connected through the suction nozzle, upper discharge outlets at the tops of the group of cyclone separators are connected through the first branch pipe, lower discharge outlets at the bottoms of the group of cyclone separators are connected through the second branch pipe, and the input end of the vibrating screen and the first branch pipe are connected with the input end of the vibrating screen through the first feeding pipe. Therefore, the suction nozzle can be provided with the guide pipes in different directions, and the pipe openings of the input ends of the guide pipes are arranged in different workshops and workshops, so that the suction nozzle can simultaneously attract the catalysts and the porcelain balls in different workshops or workshops to the corresponding cyclone separators and perform corresponding treatment under the coordination of the vibrating screen, the dust remover and other components. The product of the utility model has the effect of high efficiency of catalyst treatment.

2. The utility model is designed by arranging sieve pores with different apertures on the sieve plate and controlling the conduction of the sieve pores by the air bag inside the sieve plate. This makes it possible to have sieve openings of different filter grades simultaneously for one screen deck, and only the sieve openings of one filter grade are open during the same time interval. The product of the utility model has flexible application effect.

3. According to the utility model, the main damping spring is arranged between the vibrating screen and the strut on the mounting bracket, and the group of auxiliary springs matched with the main damping spring are also arranged in the strut, so that the mode of changing the stiffness coefficient of the combined equivalent spring in a series connection mode is designed. Therefore, a user can select to draw out a certain number of inserting plates from top to bottom according to the actual power of the vibrating screen, and the stiffness coefficient of the combined spring meets the optimal requirement. The product of the utility model has the effect of long service life.

Drawings

FIG. 1 is a pictorial view of the present invention from a first perspective;

FIG. 2 is a pictorial view of the mounting bracket of the present invention from a second perspective;

FIG. 3 is a pictorial view, partially in section, of a mounting bracket of the present invention at a third viewing angle;

fig. 4 is a pictorial view of a screen panel according to a fourth aspect of the present invention;

FIG. 5 is a schematic view of a fifth viewing angle lower screen plate of the present invention, partially in section, separated from its internal strip bladder;

FIG. 6 is a cross-sectional view of a strip bladder of the present invention;

FIG. 7 is an enlarged view of area A of FIG. 3;

FIG. 8 is an enlarged view of area B of FIG. 5;

FIG. 9 is an enlarged view of area C of FIG. 6;

the reference numerals in the drawings denote: 1-a base; 2-a PLC control cabinet; 3, an air compressor; 4-a cyclone separator; 5-vibrating the screen; 6-a dust remover; 7-star type blanking machine; 8-a screw conveyor; 9-roots blower; 10-a suction nozzle; 11-a first branch; 12-a second branch; 13-sieve plate; 14-a discharge pipe; 15-a first feeding pipe; 16-a discharge pipe; 17-cleaning the tube; 18-a vent tube; 19-a pulse valve; 20-a knife valve; 21-a butterfly valve; 22-an exhaust duct; 23-a strip-shaped groove; 24-mesh openings; 25-strip-shaped air bags; 26-strip-shaped fixing blocks; 27-a cut-resistant film; 28-mounting a bracket; 29-a main damping spring; 30-a groove; 31-a slot; 32-inserting plates; 33-an auxiliary spring; 34-a second feeding pipe.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.

The self-suction type dust removal system for automatic catalyst screening of the embodiment is as follows, referring to fig. 1-8: the device comprises a base 1, and further comprises a PLC control cabinet 2, an air compressor 3, a group of cyclone separators 4, a vibrating screen 5, a dust remover 6, a star-shaped blanking machine 7, a screw conveyor 8 and a Roots blower 9 which are detachably arranged on the base 1.

(A)

The cyclone separators 4 are connected in parallel, the feed inlets of a group of cyclone separators 4 are connected through a suction nozzle 10, the upper discharge outlets at the tops of the group of cyclone separators 4 are connected through a first branch pipe 11, the lower discharge outlets at the bottoms of the group of cyclone separators 4 are connected through a second branch pipe 12, the input end of the vibrating screen 5 is connected with the first branch pipe 11 through a first feeding pipe 15 and the input end of the vibrating screen 5, a group of screen plates 13 are arranged in the vibrating screen 5 and sequentially increase from top to bottom according to the filtering grade, the output end of the vibrating screen 5 is provided with discharge pipes 14 which correspond to the sieve plates 13 one by one, the second branch pipes 12 are connected with the bottom of the dust remover 6 through second feed pipes 34, the bottom of the dust remover 6 is respectively provided with a discharge pipe 16 and a cleaning pipe 17, the bottom of the discharge pipe 16 is connected with the input end of the star-shaped blanking machine 7, the output end of the star-shaped blanking machine 7 is provided with a screw conveyor 8, and the top of the dust remover 6 is connected with the input end of the Roots blower 9 through a vent pipe 18; the top end of the dust remover 6 is also provided with a group of pulse valves 19, the pipe orifice of the cleaning pipe 17 is provided with a knife valve 20, the branch pipes of the suction nozzle 10 connected with each cyclone separation are provided with butterfly valves 21, and the branch pipes of the first branch pipe 11 connected with each cyclone separation are provided with butterfly valves 21; the pulse valve 19, the knife valve 20 and the butterfly valve 21 are all powered by an air compressor 3, and the air compressor 3, the cyclone separator 4, the vibrating screen 5, the dust remover 6, the star-shaped blanking machine 7, the screw conveyor 8 and the Roots blower 9 are all controlled by a PLC control cabinet 2.

In the present embodiment, the number of the cyclones 4 is 2. This enables the product of the utility model to absorb the catalyst and porcelain balls of two vehicles or plants simultaneously through the suction nozzle 10.

Wherein, the butterfly valve 21 and the knife valve 20 are both used for controlling the opening of the corresponding pipeline.

The bag type dust collector 6 is selected as the dust collector 6, and has the advantages of high dust collection efficiency, stable performance, easy dust treatment, flexible use and the like; the dust remover 6 can also suck the solid catalyst and dust sucked in during the process of the porcelain ball by a suction nozzle under negative pressure for effective filtration, so that the product of the utility model can not cause air pollution to the environment during working; the output end of the roots blower 9 is also provided with an exhaust duct 22 for exhausting clean air.

In this embodiment, the number of the discharging pipe 14 is 4, so that the vibrating screen 5 can simultaneously screen out 4 catalyst particles with different size grades, thereby facilitating the subsequent recovery processing of the catalyst particles according to the category.

(II)

A set of bar groove 23 has been seted up to the inside of sieve 13 transversely with equidistant linear array's mode, the algebraic difference of bar groove 23 fore-and-aft length value and sieve 13 fore-and-aft length value equals the thickness value of baffle between two adjacent bar grooves 23, and sieve 13 has a set of sieve mesh 24 along vertically and running through with equidistant linear array's mode in the region that every bar groove 23 corresponds, and sieve mesh 24 is eccentric distribution for the projection of corresponding bar groove 23 on sieve 13, all be equipped with the bar gasbag 25 that matches with it in the bar groove 23, bar gasbag 25 provides power by air compressor machine 3. Be equipped with if sieve pore 24 of 1~10 different apertures on same sieve 13 to the aperture of all sieve pores 24 that correspond on same bar groove 23 is the same, and sieve pore 24 of different apertures is the staggered form in sieve 13's horizontal direction and distributes

In this embodiment, two kinds of sieve holes 24 with different apertures are formed in the same sieve plate 13; in the two sieve plates 13 adjacent to each other in the vertical direction, the sieve opening 24 with the smallest aperture of the upper sieve plate 13 is equal to or larger than the sieve opening 24 with the largest aperture of the lower sieve plate 13.

The strip-shaped air bags 25 are internally provided with strip-shaped fixed blocks 26 matched with the strip-shaped air bags, when the air bags are completely contracted, the sieve holes 24 on the corresponding strip-shaped grooves 23 are completely communicated, and when the air bags are completely expanded, the sieve holes 24 on the corresponding strip-shaped grooves 23 are completely closed; it is to be noted that only the holes 24 of the same filtering grade are completely open in the same time period on the same screen deck 13, and the rest of the holes 24 are completely closed.

The surface of the air bag is coated with a layer of anti-cutting film 27, so that the air bag can be effectively scratched or even lacerated by catalyst particles, and the safety, reliability and effective service life of the air bag are improved when the air bag is used.

(III)

The bottom of the vibrating screen 5 is provided with a mounting bracket 28 matched with the vibrating screen, and the top corner of the bottom of the vibrating screen 5 is connected with a corresponding pillar on the mounting bracket 28 through a main damping spring 29. The top of pillar is inwards sunken the formula and has seted up recess 30, it has slot 31 all to run through symmetrically on two opposite lateral walls on the pillar, all disassemble in the slot 31 has picture peg 32, be equipped with in the recess 30 symmetrically and be equipped with a set of auxiliary spring 33, the quantity of auxiliary spring 33 equals the quantity of picture peg 32, and the top of auxiliary spring 33 all is equipped with picture peg 32, the picture peg 32 contact of main damping spring 29 and recess 30 notch department, and the external diameter of main damping spring 29 is less than the notch size of recess 30.

In the present embodiment, the number of the auxiliary springs 33 is 2.

The precision coefficient of the auxiliary spring 33 may be the same as or different from the stiffness coefficient of the main damper spring 29. The principle of how the main damping spring 29 and the auxiliary spring 33 cooperate to change the stiffness coefficient of the entire series spring can be known from the knowledge of the series connection of springs, and when two springs are connected in series, the equivalent stiffness coefficient of the series spring is calculated by the formula: where K1 and K2 are the respective precision factors of the two springs.

Thus, a user can choose to draw out a certain number of the inserting plates 32 from top to bottom before setting the actual power of the vibrating screen 5, so that a certain number of the auxiliary springs 33 and the main damping springs 29 are combined, and the stiffness coefficient of the combined springs meets the requirement of having the best damping capacity for the actual power of the vibrating screen 5.

It should be noted that the stiffness coefficient of each auxiliary spring 33 is marked on the mounting bracket 28 when the product of the present invention is shipped.

The actual working flow of the product for treating the solid catalyst and the ceramic ball is as follows:

the suction nozzle 10 sucks the solid catalyst and the ceramic balls into the cyclone separator 4 through negative pressure, the solid catalyst enters the vibrating screen 5 through the first branch pipe 11 for screening and is discharged to a special recovery device from the corresponding discharge pipe 14; the porcelain ball enters the dust remover 6 through the second branch pipe 12 and is discharged through the star-shaped blanking machine 7 and the spiral conveyer 8 in sequence.

It is worth noting that the screw conveyor 8 also discharges the catalyst fines that are sucked in, which also need to be recovered.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.

Claims (9)

1. The utility model provides a from inhaling formula dust pelletizing system for automatic screening of catalyst, includes base (1), its characterized in that: the device also comprises a PLC control cabinet (2), an air compressor (3), a group of cyclone separators (4), a vibrating screen (5), a dust remover (6), a star-shaped blanking machine (7), a screw conveyor (8) and a Roots blower (9) which are detachably arranged on the base (1);

the cyclone separators (4) are connected in parallel, the feed inlets of a group of the cyclone separators (4) are connected through a suction nozzle (10), the upper discharge outlets at the tops of a group of the cyclone separators (4) are connected through a first branch pipe (11), the lower discharge outlets at the bottoms of a group of the cyclone separators (4) are connected through a second branch pipe (12), the input end of the vibrating screen (5) is connected with the first branch pipe (11) through a first feeding pipe (15) and the input end of the vibrating screen (5),

a group of sieve plates (13) which are sequentially increased from top to bottom according to the filtering grade are arranged in the vibrating screen (5), discharge pipes (14) which are in one-to-one correspondence with the sieve plates (13) are arranged at the output end of the vibrating screen (5), the second branch pipes (12) are connected with the bottom of the dust remover (6) through second feed pipes (34),

the bottom of the dust remover (6) is respectively provided with a discharging pipe (16) and a cleaning pipe (17), the bottom of the discharging pipe (16) is connected with the input end of a star-shaped blanking machine (7), the output end of the star-shaped blanking machine (7) is provided with a screw conveyor (8), and the top of the dust remover (6) is connected with the input end of a Roots blower (9) through a vent pipe (18);

the top end of the dust remover (6) is also provided with a group of pulse valves (19), the opening of the cleaning pipe (17) is provided with a knife valve (20), branch pipes of the suction nozzle (10) and each cyclone separation connection are provided with butterfly valves (21), and the branch pipes of the first branch pipe (11) and each cyclone separation connection are provided with butterfly valves (21);

the pulse valve (19), the knife valve (20) and the butterfly valve (21) are powered by an air compressor (3), and the air compressor (3), the cyclone separator (4), the vibrating screen (5), the dust remover (6), the star-shaped blanking machine (7), the screw conveyor (8) and the Roots blower (9) are controlled by a PLC control cabinet (2).

2. The self-suction type dust removal system for the automatic catalyst screening as claimed in claim 1, wherein the dust remover (6) is a bag type dust remover (6), and an exhaust pipe (22) is further arranged at the output end of the Roots blower (9).

3. The self-priming dust removal system for automatic catalyst screening according to claim 1, wherein the number of the discharge pipes (14) is at least 2.

4. The self-priming dust removal system for automatic catalyst screening according to claim 1, it is characterized in that a group of strip-shaped grooves (23) are arranged in the sieve plate (13) in a transverse direction in an equidistant linear array mode, the algebraic difference between the longitudinal length of the strip-shaped groove (23) and the longitudinal length of the sieve plate (13) is equal to the thickness of the baffle between two adjacent strip-shaped grooves (23), and the sieve plate (13) is provided with a group of sieve holes (24) in the corresponding area of each strip-shaped groove (23) along the longitudinal direction and in a linear array mode with equal intervals, and the projections of the sieve pores (24) on the sieve plate (13) relative to the corresponding strip-shaped grooves (23) are distributed eccentrically, the strip-shaped grooves (23) are internally provided with strip-shaped air bags (25) matched with the strip-shaped grooves, and the strip-shaped air bags (25) are powered by the air compressor (3).

5. The self-suction type dust removal system for the automatic catalyst screening is characterized in that the strip-shaped air bags (25) are internally provided with strip-shaped fixed blocks (26) matched with the strip-shaped air bags, when the air bags are completely contracted, the sieve holes (24) on the corresponding strip-shaped grooves (23) are completely communicated, and when the air bags are completely expanded, the sieve holes (24) on the corresponding strip-shaped grooves (23) are completely closed.

6. The self-suction type dust removing system for the automatic catalyst screening of claim 4, wherein 1 to 10 kinds of sieve holes (24) with different pore diameters are arranged on the same sieve plate (13), the pore diameters of all the corresponding sieve holes (24) on the same strip-shaped groove (23) are the same, and the sieve holes (24) with different pore diameters are distributed in a staggered manner in the transverse direction of the sieve plate (13).

7. The self-priming dust removal system for automatic catalyst screening according to claim 5, wherein the surfaces of the air bags are coated with a layer of cutting-proof film (27).

8. The self-priming dust removal system for the automatic catalyst screening of claim 1, wherein a mounting bracket (28) matched with the vibrating screen (5) is arranged at the bottom of the vibrating screen (5), and the top corner of the bottom of the vibrating screen (5) is connected with a corresponding pillar on the mounting bracket (28) through a main damping spring (29).

9. The self-priming dust removal system for the automatic catalyst screening of claim 8, wherein the top end of the supporting column is provided with a concave groove (30), slots (31) symmetrically penetrate through two opposite outer side walls of the supporting column, an insertion plate (32) is disassembled in each slot (31), a set of auxiliary springs (33) are symmetrically arranged in each groove (30), the number of the auxiliary springs (33) is equal to that of the insertion plates (32), the top ends of the auxiliary springs (33) are provided with the insertion plates (32), the main damping springs (29) are in contact with the insertion plates (32) at the groove openings of the grooves (30), and the outer diameter of the main damping springs (29) is smaller than the size of the groove openings of the grooves (30).

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